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avcodec/pgxdec: Fix invalid shift in write_frame_*

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Fixes: left shift of negative value -121
Fixes: 23911/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGX_fuzzer-4986800258154496

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 2020-07-25 23:14:10 +02:00
parent 4106013523
commit 165d6b876b
1 changed files with 1 additions and 1 deletions
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libavcodec/pgxdec.c
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@ -102,7 +102,7 @@ error:
for (i = 0; i < height; i++) { \
PIXEL *line = (PIXEL*)frame->data[0] + i*frame->linesize[0]/sizeof(PIXEL); \
for (j = 0; j < width; j++) { \
int val; \
unsigned val; \
if (sign) \
val = (PIXEL)bytestream2_get_ ##suffix(g) + (1 << (depth - 1)); \
else \