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avcodec/snappy: Sanity check bytestream2_get_levarint() 

Fixes: left shift of 79 by 28 places cannot be represented in type 'int'
Fixes: 20202/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HAP_fuzzer-5719004081815552
Fixes: 20219/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HAP_fuzzer-5641738677125120
Fixes: 20389/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HAP_fuzzer-5680721517871104

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 be54da2117)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-01-19 21:51:11 +01:00
parent 5e83098085
commit bc77d29d9e
1 changed files with 2 additions and 0 deletions
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libavcodec/snappy.c
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@ -39,6 +39,8 @@ static int64_t bytestream2_get_levarint(GetByteContext *gb)
do {
tmp = bytestream2_get_byte(gb);
if (shift > 31 || ((tmp & 127LL) << shift) > INT_MAX)
return AVERROR_INVALIDDATA;
val |= (tmp & 127) << shift;
shift += 7;
} while (tmp & 128);