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avcodec/tiff: Update pointer only when the result is used 

Fixes: runtime error: signed integer overflow: 538976288 * 32 cannot be represented in type 'int'
Fixes: 2310/clusterfuzz-testcase-minimized-4534784887881728

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 2017-06-22 20:21:05 +02:00
parent 7e98da9c4f
commit 27f80ab016
1 changed files with 2 additions and 1 deletions
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3
libavcodec/tiff.c
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@ -1306,6 +1306,8 @@ static int decode_frame(AVCodecContext *avctx,
stride = p->linesize[plane];
dst = p->data[plane];
for (i = 0; i < s->height; i += s->rps) {
if (i)
dst += s->rps * stride;
if (s->stripsizesoff)
ssize = ff_tget(&stripsizes, s->sstype, le);
else
@ -1326,7 +1328,6 @@ static int decode_frame(AVCodecContext *avctx,
return ret;
break;
}
dst += s->rps * stride;
}
if (s->predictor == 2) {
if (s->photometric == TIFF_PHOTOMETRIC_YCBCR) {