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-rw-r--r--gnu/packages/patches/jbig2dec-CVE-2017-7885.patch38
1 files changed, 38 insertions, 0 deletions
diff --git a/gnu/packages/patches/jbig2dec-CVE-2017-7885.patch b/gnu/packages/patches/jbig2dec-CVE-2017-7885.patch
new file mode 100644
index 0000000000..a598392765
--- /dev/null
+++ b/gnu/packages/patches/jbig2dec-CVE-2017-7885.patch
@@ -0,0 +1,38 @@
+Fix CVE-2017-7885:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7885
+https://bugs.ghostscript.com/show_bug.cgi?id=697703
+
+Patch copied from upstream source repository:
+
+https://git.ghostscript.com/?p=jbig2dec.git;a=commit;h=258290340bb657c9efb44457f717b0d8b49f4aa3
+
+From 258290340bb657c9efb44457f717b0d8b49f4aa3 Mon Sep 17 00:00:00 2001
+From: Shailesh Mistry <shailesh.mistry@hotmail.co.uk>
+Date: Wed, 3 May 2017 22:06:01 +0100
+Subject: [PATCH] Bug 697703: Prevent integer overflow vulnerability.
+
+Add extra check for the offset being greater than the size
+of the image and hence reading off the end of the buffer.
+
+Thank you to Dai Ge for finding this issue and suggesting a patch.
+---
+ jbig2_symbol_dict.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/jbig2_symbol_dict.c b/jbig2_symbol_dict.c
+index 4acaba9..36225cb 100644
+--- a/jbig2_symbol_dict.c
++++ b/jbig2_symbol_dict.c
+@@ -629,7 +629,7 @@ jbig2_decode_symbol_dict(Jbig2Ctx *ctx,
+ byte *dst = image->data;
+
+ /* SumatraPDF: prevent read access violation */
+- if (size - jbig2_huffman_offset(hs) < image->height * stride) {
++ if ((size - jbig2_huffman_offset(hs) < image->height * stride) || (size < jbig2_huffman_offset(hs))) {
+ jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "not enough data for decoding (%d/%d)", image->height * stride,
+ size - jbig2_huffman_offset(hs));
+ jbig2_image_release(ctx, image);
+--
+2.13.0
+