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avcodec/alacdsp: Fix invalid shift in append_extra_bits()

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Fixes: left shift of negative value -1
Fixes: 21390/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-6242539519868928

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 2020-04-26 19:29:39 +02:00
parent 62e4003780
commit 49ae034b42
1 changed files with 1 additions and 1 deletions
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libavcodec/alacdsp.c
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@ -49,7 +49,7 @@ static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
for (ch = 0; ch < channels; ch++) for (ch = 0; ch < channels; ch++)
for (i = 0; i < nb_samples; i++) for (i = 0; i < nb_samples; i++)
buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i]; buffer[ch][i] = ((unsigned)buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
} }
av_cold void ff_alacdsp_init(ALACDSPContext *c) av_cold void ff_alacdsp_init(ALACDSPContext *c)