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avcodec/alac: Fix invalid shifts in 20/24 bps

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Fixes: left shift of negative value -256
Fixes: 16892/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-4880802642395136

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 b30c07cc2b9ee5bc52e1782eba9aa40e99085a7e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-06 10:46:38 +02:00
parent c87327f4a5
commit d01ab37867
1 changed files with 2 additions and 2 deletions
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4
libavcodec/alac.c
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@ -397,13 +397,13 @@ static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
case 20: {
for (ch = 0; ch < channels; ch++) {
for (i = 0; i < alac->nb_samples; i++)
alac->output_samples_buffer[ch][i] <<= 12;
alac->output_samples_buffer[ch][i] *= 1 << 12;
}}
break;
case 24: {
for (ch = 0; ch < channels; ch++) {
for (i = 0; i < alac->nb_samples; i++)
alac->output_samples_buffer[ch][i] <<= 8;
alac->output_samples_buffer[ch][i] *= 1 << 8;
}}
break;
}