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avcodec/diracdec: Fix potential integer overflow

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Fixes CID1361948

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-05-19 18:02:53 +02:00
parent 7494b49780
commit 7ecfe4dc36
1 changed files with 2 additions and 2 deletions
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4
libavcodec/diracdec.c
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@ -903,8 +903,8 @@ static int decode_lowdelay(DiracContext *s)
} else {
for (slice_y = 0; bufsize > 0 && slice_y < s->num_y; slice_y++) {
for (slice_x = 0; bufsize > 0 && slice_x < s->num_x; slice_x++) {
bytes = (slice_num+1) * s->lowdelay.bytes.num / s->lowdelay.bytes.den
- slice_num * s->lowdelay.bytes.num / s->lowdelay.bytes.den;
bytes = (slice_num+1) * (int64_t)s->lowdelay.bytes.num / s->lowdelay.bytes.den
- slice_num * (int64_t)s->lowdelay.bytes.num / s->lowdelay.bytes.den;
slices[slice_num].bytes = bytes;
slices[slice_num].slice_x = slice_x;
slices[slice_num].slice_y = slice_y;