From 6962fd586e1a9a98828866dcfb4114af30c8c756 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 15 Aug 2019 18:47:54 +0200 Subject: avcodec/vc1_block: Check for double escapes Fixes: out of array read Fixes: 16331/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3IMAGE_fuzzer-5672735195267072 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/vc1_block.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'libavcodec') diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c index 94184b0873..775e3c516b 100644 --- a/libavcodec/vc1_block.c +++ b/libavcodec/vc1_block.c @@ -526,7 +526,7 @@ static int vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int escape = decode210(gb); if (escape != 2) { index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3); - if (index < 0) + if (index >= ff_vc1_ac_sizes[codingset] - 1U) return AVERROR_INVALIDDATA; run = vc1_index_decode_table[codingset][index][0]; level = vc1_index_decode_table[codingset][index][1]; -- cgit v1.2.3