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avutil/tx: avoid negative left shifts 

Fixes: left shift of negative value -1
Fixes: 33736/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SIREN_fuzzer-6657785795313664

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-05-04 18:22:40 +02:00
parent c067d20177
commit 85b883429f
1 changed files with 2 additions and 2 deletions
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4
libavutil/tx.c
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@ -97,9 +97,9 @@ static inline int split_radix_permutation(int i, int m, int inverse)
if (m <= 1)
return i & 1;
if (!(i & m))
return (split_radix_permutation(i, m, inverse) << 1);
return split_radix_permutation(i, m, inverse) * 2;
m >>= 1;
return (split_radix_permutation(i, m, inverse) << 2) + 1 - 2*(!(i & m) ^ inverse);
return split_radix_permutation(i, m, inverse) * 4 + 1 - 2*(!(i & m) ^ inverse);
}
int ff_tx_gen_ptwo_revtab(AVTXContext *s, int invert_lookup)