From: Tobias Geerinckx-Rice <me@tobias.gr>
Date: Thu, 28 Feb 2019 20:29:00 +0100
Subject: [PATCH] netpbm: Fix CVE-2017-2586.

Copied verbatim from Debian[0].

[0]: https://sources.debian.org/data/main/n/netpbm-free/2:10.78.05-0.1/debian/patches/netpbm-CVE-2017-2586.patch

---
diff -urNp old/converter/other/svgtopam.c new/converter/other/svgtopam.c
--- old/converter/other/svgtopam.c	2017-02-08 12:11:02.593690917 +0100
+++ new/converter/other/svgtopam.c	2017-02-08 12:13:05.192846469 +0100
@@ -676,7 +676,7 @@ stringToUint(const char *   const string
 
     /* TODO: move this to nstring.c */
 
-    if (strlen(string) == 0)
+    if (string == NULL || strlen(string) == 0)
         pm_asprintf(errorP, "Value is a null string");
     else {
         char * tailptr;
