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nixpkgs/pkgs/misc/ghostscript/CVE-2015-3228.patch

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Description: Sanity check for memory allocation.
In gs_heap_alloc_bytes(), add a sanity check to ensure we don't overflow the
variable holding the actual number of bytes we allocate.
Origin: upstream, http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=0c0b085
Author: Chris Liddell <chris.liddell@artifex.com>
Forwarded: yes
Bug-Debian: http://bugs.debian.org/793489
Last-Update: 2015-07-26
--- a/base/gsmalloc.c
+++ b/base/gsmalloc.c
@@ -178,7 +178,7 @@
} else {
uint added = size + sizeof(gs_malloc_block_t);
- if (mmem->limit - added < mmem->used)
+ if (added <= size || mmem->limit - added < mmem->used)
set_msg("exceeded limit");
else if ((ptr = (byte *) Memento_label(malloc(added), cname)) == 0)
set_msg("failed");