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