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avcodec/smacker: Fix integer overflow in signed int multiply in SMK_BLK_FILL

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Fixes: signed integer overflow: 238 * 16843009 cannot be represented in type 'int'
Fixes: 16958/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SMACKER_fuzzer-5193905355620352

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 033d2c4884)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-06 10:55:26 +02:00
parent 2f095670c8
commit e15fd9bc25
1 changed files with 1 additions and 1 deletions
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2
libavcodec/smacker.c
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@ -531,7 +531,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
while(run-- && blk < blocks){
uint32_t col;
out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
col = mode * 0x01010101;
col = mode * 0x01010101U;
for(i = 0; i < 4; i++) {
*((uint32_t*)out) = col;
out += stride;