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avcodec/utvideodec: Fix integer overflow in decode_plane()

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Fixes: signed integer overflow: 2147483594 + 142 cannot be represented in type 'int'
Fixes: 20492/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_fuzzer-5658568101724160

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 876cfa67f37e944b0f42cb67b2de4e2e06f52e82)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-05-10 21:16:59 +02:00
parent 8858e92b7a
commit 15062f6466
1 changed files with 1 additions and 1 deletions
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libavcodec/utvideodec.c
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@ -260,7 +260,7 @@ static int decode_plane(UtvideoContext *c, int plane_no,
for (i = 0; i < width * step; i += step) { for (i = 0; i < width * step; i += step) {
pix = fsym; pix = fsym;
if (use_pred) { if (use_pred) {
prev += pix; prev += (unsigned)pix;
pix = prev; pix = prev;
} }
dest[i] = pix; dest[i] = pix;