c12b234695
* gnu/packages/gd.scm (gd)[replacement]: New field. (gd/fixed): New variable. * gnu/packages/patches/gd-CVE-2019-6977.patch, gnu/packages/patches/gd-CVE-2019-6978.patch: New files. * gnu/local.mk (dist_patch_DATA): Add them.
301 lines
8.2 KiB
Diff
301 lines
8.2 KiB
Diff
Fix CVE-2019-6978:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6978
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Patch copied from upstream source repository:
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https://github.com/libgd/libgd/commit/553702980ae89c83f2d6e254d62cf82e204956d0
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From 553702980ae89c83f2d6e254d62cf82e204956d0 Mon Sep 17 00:00:00 2001
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From: "Christoph M. Becker" <cmbecker69@gmx.de>
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Date: Thu, 17 Jan 2019 11:54:55 +0100
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Subject: [PATCH] Fix #492: Potential double-free in gdImage*Ptr()
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Whenever `gdImage*Ptr()` calls `gdImage*Ctx()` and the latter fails, we
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must not call `gdDPExtractData()`; otherwise a double-free would
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happen. Since `gdImage*Ctx()` are void functions, and we can't change
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that for BC reasons, we're introducing static helpers which are used
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internally.
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We're adding a regression test for `gdImageJpegPtr()`, but not for
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`gdImageGifPtr()` and `gdImageWbmpPtr()` since we don't know how to
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trigger failure of the respective `gdImage*Ctx()` calls.
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This potential security issue has been reported by Solmaz Salimi (aka.
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Rooney).
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---
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src/gd_gif_out.c | 18 +++++++++++++++---
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src/gd_jpeg.c | 20 ++++++++++++++++----
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src/gd_wbmp.c | 21 ++++++++++++++++++---
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tests/jpeg/.gitignore | 1 +
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tests/jpeg/CMakeLists.txt | 1 +
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tests/jpeg/Makemodule.am | 3 ++-
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tests/jpeg/jpeg_ptr_double_free.c | 31 +++++++++++++++++++++++++++++++
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7 files changed, 84 insertions(+), 11 deletions(-)
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create mode 100644 tests/jpeg/jpeg_ptr_double_free.c
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diff --git a/src/gd_gif_out.c b/src/gd_gif_out.c
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index 298a581..d5a9534 100644
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--- a/src/gd_gif_out.c
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+++ b/src/gd_gif_out.c
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@@ -99,6 +99,7 @@ static void char_init(GifCtx *ctx);
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static void char_out(int c, GifCtx *ctx);
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static void flush_char(GifCtx *ctx);
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+static int _gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out);
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@@ -131,8 +132,11 @@ BGD_DECLARE(void *) gdImageGifPtr(gdImagePtr im, int *size)
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void *rv;
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gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
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if (out == NULL) return NULL;
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- gdImageGifCtx(im, out);
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- rv = gdDPExtractData(out, size);
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+ if (!_gdImageGifCtx(im, out)) {
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+ rv = gdDPExtractData(out, size);
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+ } else {
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+ rv = NULL;
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+ }
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out->gd_free(out);
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return rv;
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}
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@@ -220,6 +224,12 @@ BGD_DECLARE(void) gdImageGif(gdImagePtr im, FILE *outFile)
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*/
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BGD_DECLARE(void) gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
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+{
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+ _gdImageGifCtx(im, out);
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+}
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+
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+/* returns 0 on success, 1 on failure */
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+static int _gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
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{
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gdImagePtr pim = 0, tim = im;
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int interlace, BitsPerPixel;
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@@ -231,7 +241,7 @@ BGD_DECLARE(void) gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
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based temporary image. */
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pim = gdImageCreatePaletteFromTrueColor(im, 1, 256);
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if(!pim) {
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- return;
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+ return 1;
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}
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tim = pim;
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}
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@@ -247,6 +257,8 @@ BGD_DECLARE(void) gdImageGifCtx(gdImagePtr im, gdIOCtxPtr out)
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/* Destroy palette based temporary image. */
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gdImageDestroy( pim);
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}
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+
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+ return 0;
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}
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diff --git a/src/gd_jpeg.c b/src/gd_jpeg.c
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index fc05842..96ef430 100644
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--- a/src/gd_jpeg.c
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+++ b/src/gd_jpeg.c
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@@ -117,6 +117,8 @@ static void fatal_jpeg_error(j_common_ptr cinfo)
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exit(99);
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}
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+static int _gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality);
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+
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/*
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* Write IM to OUTFILE as a JFIF-formatted JPEG image, using quality
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* QUALITY. If QUALITY is in the range 0-100, increasing values
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@@ -231,8 +233,11 @@ BGD_DECLARE(void *) gdImageJpegPtr(gdImagePtr im, int *size, int quality)
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void *rv;
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gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
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if (out == NULL) return NULL;
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- gdImageJpegCtx(im, out, quality);
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- rv = gdDPExtractData(out, size);
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+ if (!_gdImageJpegCtx(im, out, quality)) {
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+ rv = gdDPExtractData(out, size);
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+ } else {
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+ rv = NULL;
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+ }
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out->gd_free(out);
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return rv;
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}
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@@ -253,6 +258,12 @@ void jpeg_gdIOCtx_dest(j_compress_ptr cinfo, gdIOCtx *outfile);
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*/
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BGD_DECLARE(void) gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality)
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+{
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+ _gdImageJpegCtx(im, outfile, quality);
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+}
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+
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+/* returns 0 on success, 1 on failure */
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+static int _gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality)
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{
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struct jpeg_compress_struct cinfo;
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struct jpeg_error_mgr jerr;
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@@ -287,7 +298,7 @@ BGD_DECLARE(void) gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality)
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if(row) {
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gdFree(row);
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}
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- return;
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+ return 1;
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}
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cinfo.err->emit_message = jpeg_emit_message;
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@@ -328,7 +339,7 @@ BGD_DECLARE(void) gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality)
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if(row == 0) {
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gd_error("gd-jpeg: error: unable to allocate JPEG row structure: gdCalloc returns NULL\n");
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jpeg_destroy_compress(&cinfo);
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- return;
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+ return 1;
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}
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rowptr[0] = row;
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@@ -405,6 +416,7 @@ BGD_DECLARE(void) gdImageJpegCtx(gdImagePtr im, gdIOCtx *outfile, int quality)
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jpeg_finish_compress(&cinfo);
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jpeg_destroy_compress(&cinfo);
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gdFree(row);
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+ return 0;
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}
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diff --git a/src/gd_wbmp.c b/src/gd_wbmp.c
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index f19a1c9..a49bdbe 100644
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--- a/src/gd_wbmp.c
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+++ b/src/gd_wbmp.c
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@@ -88,6 +88,8 @@ int gd_getin(void *in)
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return (gdGetC((gdIOCtx *)in));
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}
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+static int _gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out);
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+
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/*
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Function: gdImageWBMPCtx
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@@ -100,6 +102,12 @@ int gd_getin(void *in)
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out - the stream where to write
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*/
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BGD_DECLARE(void) gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out)
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+{
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+ _gdImageWBMPCtx(image, fg, out);
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+}
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+
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+/* returns 0 on success, 1 on failure */
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+static int _gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out)
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{
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int x, y, pos;
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Wbmp *wbmp;
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@@ -107,7 +115,7 @@ BGD_DECLARE(void) gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out)
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/* create the WBMP */
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if((wbmp = createwbmp(gdImageSX(image), gdImageSY(image), WBMP_WHITE)) == NULL) {
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gd_error("Could not create WBMP\n");
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- return;
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+ return 1;
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}
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/* fill up the WBMP structure */
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@@ -123,11 +131,15 @@ BGD_DECLARE(void) gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out)
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/* write the WBMP to a gd file descriptor */
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if(writewbmp(wbmp, &gd_putout, out)) {
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+ freewbmp(wbmp);
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gd_error("Could not save WBMP\n");
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+ return 1;
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}
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/* des submitted this bugfix: gdFree the memory. */
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freewbmp(wbmp);
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+
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+ return 0;
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}
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/*
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@@ -271,8 +283,11 @@ BGD_DECLARE(void *) gdImageWBMPPtr(gdImagePtr im, int *size, int fg)
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void *rv;
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gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
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if (out == NULL) return NULL;
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- gdImageWBMPCtx(im, fg, out);
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- rv = gdDPExtractData(out, size);
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+ if (!_gdImageWBMPCtx(im, fg, out)) {
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+ rv = gdDPExtractData(out, size);
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+ } else {
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+ rv = NULL;
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+ }
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out->gd_free(out);
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return rv;
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}
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#diff --git a/tests/jpeg/.gitignore b/tests/jpeg/.gitignore
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#index c28aa87..13bcf04 100644
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#--- a/tests/jpeg/.gitignore
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#+++ b/tests/jpeg/.gitignore
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#@@ -3,5 +3,6 @@
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# /jpeg_empty_file
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# /jpeg_im2im
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# /jpeg_null
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#+/jpeg_ptr_double_free
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# /jpeg_read
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# /jpeg_resolution
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diff --git a/tests/jpeg/CMakeLists.txt b/tests/jpeg/CMakeLists.txt
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index 19964b0..a8d8162 100644
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--- a/tests/jpeg/CMakeLists.txt
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+++ b/tests/jpeg/CMakeLists.txt
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@@ -2,6 +2,7 @@ IF(JPEG_FOUND)
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LIST(APPEND TESTS_FILES
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jpeg_empty_file
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jpeg_im2im
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+ jpeg_ptr_double_free
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jpeg_null
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)
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diff --git a/tests/jpeg/Makemodule.am b/tests/jpeg/Makemodule.am
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index 7e5d317..b89e169 100644
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--- a/tests/jpeg/Makemodule.am
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+++ b/tests/jpeg/Makemodule.am
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@@ -2,7 +2,8 @@ if HAVE_LIBJPEG
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libgd_test_programs += \
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jpeg/jpeg_empty_file \
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jpeg/jpeg_im2im \
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- jpeg/jpeg_null
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+ jpeg/jpeg_null \
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+ jpeg/jpeg_ptr_double_free
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if HAVE_LIBPNG
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libgd_test_programs += \
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diff --git a/tests/jpeg/jpeg_ptr_double_free.c b/tests/jpeg/jpeg_ptr_double_free.c
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new file mode 100644
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index 0000000..df5a510
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--- /dev/null
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+++ b/tests/jpeg/jpeg_ptr_double_free.c
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@@ -0,0 +1,31 @@
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+/**
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+ * Test that failure to convert to JPEG returns NULL
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+ *
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+ * We are creating an image, set its width to zero, and pass this image to
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+ * `gdImageJpegPtr()` which is supposed to fail, and as such should return NULL.
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+ *
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+ * See also <https://github.com/libgd/libgd/issues/381>
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+ */
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+
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+
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+#include "gd.h"
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+#include "gdtest.h"
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+
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+
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+int main()
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+{
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+ gdImagePtr src, dst;
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+ int size;
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+
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+ src = gdImageCreateTrueColor(1, 10);
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+ gdTestAssert(src != NULL);
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+
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+ src->sx = 0; /* this hack forces gdImageJpegPtr() to fail */
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+
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+ dst = gdImageJpegPtr(src, &size, 0);
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+ gdTestAssert(dst == NULL);
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+
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+ gdImageDestroy(src);
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+
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+ return gdNumFailures();
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+}
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--
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2.20.1
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