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smvjpegdec: make sure cur_frame is not negative

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This fixes a heap-buffer-overflow detected by AddressSanitizer.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Andreas Cadhalpun 2016-11-10 22:09:03 +01:00
parent 005d058f42
commit 360bc0d90a
1 changed files with 4 additions and 0 deletions
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4
libavcodec/smvjpegdec.c
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@ -152,6 +152,10 @@ static int smvjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_siz
cur_frame = avpkt->pts % s->frames_per_jpeg;
/* cur_frame is later used to calculate the buffer offset, so it mustn't be negative */
if (cur_frame < 0)
cur_frame += s->frames_per_jpeg;
/* Are we at the start of a block? */
if (!cur_frame) {
av_frame_unref(mjpeg_data);