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avcodec/cbs_av1: Fix writing uvlc numbers >= INT_MAX 

Fixes: assertion failure
Fixes: left shift of 1 by 31 places cannot be represented in type 'int'
Fixes: 23264/clusterfuzz-testcase-minimized-ffmpeg_BSF_AV1_METADATA_fuzzer-6308429248593920

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit 6f06c17a55)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-06-18 14:37:38 +02:00
parent d1fe26f2b7
commit 847bb1d522
1 changed files with 3 additions and 2 deletions
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5
libavcodec/cbs_av1.c
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@ -125,8 +125,9 @@ static int cbs_av1_write_uvlc(CodedBitstreamContext *ctx, PutBitContext *pbc,
put_bits(pbc, 1, 1);
} else {
zeroes = av_log2(value + 1);
v = value - (1 << zeroes) + 1;
put_bits(pbc, zeroes + 1, 1);
v = value - (1U << zeroes) + 1;
put_bits(pbc, zeroes, 0);
put_bits(pbc, 1, 1);
put_bits(pbc, zeroes, v);
}