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avcodec/mlp_parser: Check if synccode is within buffer

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Fixes: undefined shift
Fixes: 9216/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TRUEHD_fuzzer-6281404575907840

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 51ac3f43b8bf3b7f2af555af319cd240bb8b4ebf)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-07-29 13:16:37 +02:00
parent f9235773d6
commit 07255282d0
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mlp_parser.c
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@ -320,7 +320,7 @@ static int mlp_parse(AVCodecParserContext *s,
mp->bytes_left = 0;
}
sync_present = (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba;
sync_present = buf_size >= 8 && (AV_RB32(buf + 4) & 0xfffffffe) == 0xf8726fba;
if (!sync_present) {
/* The first nibble of a frame is a parity check of the 4-byte