Fix CVE-2017-7975: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7975 https://bugs.ghostscript.com/show_bug.cgi?id=697693 Patch copied from upstream source repository: https://git.ghostscript.com/?p=jbig2dec.git;a=commit;h=f8992b8fe65c170c8624226f127c5c4bfed42c66 From f8992b8fe65c170c8624226f127c5c4bfed42c66 Mon Sep 17 00:00:00 2001 From: Shailesh Mistry <shailesh.mistry@hotmail.co.uk> Date: Wed, 26 Apr 2017 22:12:14 +0100 Subject: [PATCH] Bug 697693: Prevent SEGV due to integer overflow. While building a Huffman table, the start and end points were susceptible to integer overflow. Thank you to Jiaqi for finding this issue and suggesting a patch. --- jbig2_huffman.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/jbig2_huffman.c b/jbig2_huffman.c index 511e461..b4189a1 100644 --- a/jbig2_huffman.c +++ b/jbig2_huffman.c @@ -421,8 +421,8 @@ jbig2_build_huffman_table(Jbig2Ctx *ctx, const Jbig2HuffmanParams *params) if (PREFLEN == CURLEN) { int RANGELEN = lines[CURTEMP].RANGELEN; - int start_j = CURCODE << shift; - int end_j = (CURCODE + 1) << shift; + uint32_t start_j = CURCODE << shift; + uint32_t end_j = (CURCODE + 1) << shift; byte eflags = 0; if (end_j > max_j) { -- 2.13.0