libcroco: Fix CVE-2017-{7960,7961}.

* gnu/packages/gnome.scm (libcroco)[replacement]: New field.
(libcroco/fixed): New variable.
* gnu/packages/patches/libcroco-CVE-2017-7960.patch,
gnu/packages/patches/libcroco-CVE-2017-7961.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.

gnu/local.mk

@@ -691,6 +691,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/libbase-use-own-logging.patch		\
   %D%/packages/patches/libbonobo-activation-test-race.patch	\
   %D%/packages/patches/libcanberra-sound-theme-freedesktop.patch \
+  %D%/packages/patches/libcroco-CVE-2017-7960.patch		\
+  %D%/packages/patches/libcroco-CVE-2017-7961.patch		\
   %D%/packages/patches/libdrm-symbol-check.patch		\
   %D%/packages/patches/libetonyek-build-with-mdds-1.2.patch     \
   %D%/packages/patches/libevent-dns-tests.patch			\

gnu/packages/gnome.scm

@@ -945,6 +945,7 @@ the GNOME desktop environment.")
 (define-public libcroco
   (package
     (name "libcroco")
+    (replacement libcroco/fixed)
     (version "0.6.11")
     (source (origin
               (method url-fetch)
@@ -972,6 +973,19 @@ XML/CSS rendering engine.")
     ;; LGPLv2.1-only.
     (license license:lgpl2.1)))
 
+(define libcroco/fixed
+  (package
+    (inherit libcroco)
+    (replacement #f)
+    (source
+      (origin
+        (inherit (package-source libcroco))
+        (patches
+          (append
+            (origin-patches (package-source libcroco))
+            (search-patches "libcroco-CVE-2017-7960.patch"
+                            "libcroco-CVE-2017-7961.patch")))))))
+
 (define-public libgsf
   (package
     (name "libgsf")

gnu/packages/patches/libcroco-CVE-2017-7960.patch

@@ -0,0 +1,66 @@
+Fix CVE-2017-7960:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7960
+
+Patch copied from upstream source repository:
+
+https://git.gnome.org/browse/libcroco/commit/?id=898e3a8c8c0314d2e6b106809a8e3e93cf9d4394
+
+From 898e3a8c8c0314d2e6b106809a8e3e93cf9d4394 Mon Sep 17 00:00:00 2001
+From: Ignacio Casal Quinteiro <qignacio@amazon.com>
+Date: Sun, 16 Apr 2017 13:13:43 +0200
+Subject: input: check end of input before reading a byte
+
+When reading bytes we weren't check that the index wasn't
+out of bound and this could produce an invalid read which
+could deal to a security bug.
+---
+ src/cr-input.c | 11 +++++++++--
+ 1 file changed, 9 insertions(+), 2 deletions(-)
+
+diff --git a/src/cr-input.c b/src/cr-input.c
+index 49000b1..3b63a88 100644
+--- a/src/cr-input.c
++++ b/src/cr-input.c
+@@ -256,7 +256,7 @@ cr_input_new_from_uri (const gchar * a_file_uri, enum CREncoding a_enc)
+                  *we should  free buf here because it's own by CRInput.
+                  *(see the last parameter of cr_input_new_from_buf().
+                  */
+-                buf = NULL ;
++                buf = NULL;
+         }
+ 
+  cleanup:
+@@ -404,6 +404,8 @@ cr_input_get_nb_bytes_left (CRInput const * a_this)
+ enum CRStatus
+ cr_input_read_byte (CRInput * a_this, guchar * a_byte)
+ {
++        gulong nb_bytes_left = 0;
++
+         g_return_val_if_fail (a_this && PRIVATE (a_this)
+                               && a_byte, CR_BAD_PARAM_ERROR);
+ 
+@@ -413,6 +415,12 @@ cr_input_read_byte (CRInput * a_this, guchar * a_byte)
+         if (PRIVATE (a_this)->end_of_input == TRUE)
+                 return CR_END_OF_INPUT_ERROR;
+ 
++        nb_bytes_left = cr_input_get_nb_bytes_left (a_this);
++
++        if (nb_bytes_left < 1) {
++                return CR_END_OF_INPUT_ERROR;
++        }
++
+         *a_byte = PRIVATE (a_this)->in_buf[PRIVATE (a_this)->next_byte_index];
+ 
+         if (PRIVATE (a_this)->nb_bytes -
+@@ -477,7 +485,6 @@ cr_input_read_char (CRInput * a_this, guint32 * a_char)
+                 if (*a_char == '\n') {
+                         PRIVATE (a_this)->end_of_line = TRUE;
+                 }
+-
+         }
+ 
+         return status;
+-- 
+cgit v0.12
+

gnu/packages/patches/libcroco-CVE-2017-7961.patch

@@ -0,0 +1,50 @@
+Fix CVE-2017-7961:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7961
+
+Patch copied from upstream source repository:
+
+https://git.gnome.org/browse/libcroco/commit/?id=9ad72875e9f08e4c519ef63d44cdbd94aa9504f7
+
+From 9ad72875e9f08e4c519ef63d44cdbd94aa9504f7 Mon Sep 17 00:00:00 2001
+From: Ignacio Casal Quinteiro <qignacio@amazon.com>
+Date: Sun, 16 Apr 2017 13:56:09 +0200
+Subject: tknzr: support only max long rgb values
+
+This fixes a possible out of bound when reading rgbs which
+are longer than the support MAXLONG
+---
+ src/cr-tknzr.c | 10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+diff --git a/src/cr-tknzr.c b/src/cr-tknzr.c
+index 1a7cfeb..1548c35 100644
+--- a/src/cr-tknzr.c
++++ b/src/cr-tknzr.c
+@@ -1279,6 +1279,11 @@ cr_tknzr_parse_rgb (CRTknzr * a_this, CRRgb ** a_rgb)
+         status = cr_tknzr_parse_num (a_this, &num);
+         ENSURE_PARSING_COND ((status == CR_OK) && (num != NULL));
+ 
++        if (num->val > G_MAXLONG) {
++                status = CR_PARSING_ERROR;
++                goto error;
++        }
++
+         red = num->val;
+         cr_num_destroy (num);
+         num = NULL;
+@@ -1298,6 +1303,11 @@ cr_tknzr_parse_rgb (CRTknzr * a_this, CRRgb ** a_rgb)
+                 status = cr_tknzr_parse_num (a_this, &num);
+                 ENSURE_PARSING_COND ((status == CR_OK) && (num != NULL));
+ 
++                if (num->val > G_MAXLONG) {
++                        status = CR_PARSING_ERROR;
++                        goto error;
++                }
++
+                 PEEK_BYTE (a_this, 1, &next_bytes[0]);
+                 if (next_bytes[0] == '%') {
+                         SKIP_CHARS (a_this, 1);
+-- 
+cgit v0.12
+