41 lines
1.3 KiB
Diff
41 lines
1.3 KiB
Diff
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Fix CVE-2017-7975:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7975
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https://bugs.ghostscript.com/show_bug.cgi?id=697693
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Patch copied from upstream source repository:
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https://git.ghostscript.com/?p=jbig2dec.git;a=commit;h=f8992b8fe65c170c8624226f127c5c4bfed42c66
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From f8992b8fe65c170c8624226f127c5c4bfed42c66 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, 26 Apr 2017 22:12:14 +0100
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Subject: [PATCH] Bug 697693: Prevent SEGV due to integer overflow.
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While building a Huffman table, the start and end points were susceptible
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to integer overflow.
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Thank you to Jiaqi for finding this issue and suggesting a patch.
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---
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jbig2_huffman.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/jbig2_huffman.c b/jbig2_huffman.c
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index 511e461..b4189a1 100644
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--- a/jbig2_huffman.c
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+++ b/jbig2_huffman.c
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@@ -421,8 +421,8 @@ jbig2_build_huffman_table(Jbig2Ctx *ctx, const Jbig2HuffmanParams *params)
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if (PREFLEN == CURLEN) {
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int RANGELEN = lines[CURTEMP].RANGELEN;
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- int start_j = CURCODE << shift;
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- int end_j = (CURCODE + 1) << shift;
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+ uint32_t start_j = CURCODE << shift;
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+ uint32_t end_j = (CURCODE + 1) << shift;
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byte eflags = 0;
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if (end_j > max_j) {
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--
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2.13.0
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