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avcodec/cfhd: Fix negative shift in cfhd_decode()

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Fixes: left shift of negative value -1
Fixes: 30714/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CFHD_fuzzer-4867823371419648

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 2021-02-17 00:02:04 +01:00
parent 07de796b5d
commit cd3ab3a09b
1 changed files with 2 additions and 2 deletions
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4
libavcodec/cfhd.c
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@ -811,7 +811,7 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
const uint16_t q = s->quantisation;
for (i = 0; i < run; i++) {
*coeff_data |= coeff << 8;
*coeff_data |= coeff * 256;
*coeff_data++ *= q;
}
} else {
@ -842,7 +842,7 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
const uint16_t q = s->quantisation;
for (i = 0; i < run; i++) {
*coeff_data |= coeff << 8;
*coeff_data |= coeff * 256;
*coeff_data++ *= q;
}
} else {