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avcodec/xsubdec: fix overflow in alpha handling 

Fixes: left shift of 255 by 24 places cannot be represented in type 'int'
Fixes: 18368/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XSUB_fuzzer-5702665442426880

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 9ea9973959)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-23 22:08:37 +02:00
parent 571c66659d
commit d32058276c
1 changed files with 1 additions and 1 deletions
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libavcodec/xsubdec.c
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@ -130,7 +130,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
((uint32_t *)sub->rects[0]->data[1])[i] |= 0xff000000;
} else {
for (i = 0; i < sub->rects[0]->nb_colors; i++)
((uint32_t *)sub->rects[0]->data[1])[i] |= *buf++ << 24;
((uint32_t *)sub->rects[0]->data[1])[i] |= (unsigned)*buf++ << 24;
}
#if FF_API_AVPICTURE