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avcodec_decode_audio4: check got_frame_ptr before handling initial skip 

Fixes out of array accesses

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-02-21 22:00:19 +01:00
parent 47619e41c4
commit 8a6449167a
1 changed files with 1 additions and 1 deletions
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2
libavcodec/utils.c
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@ -1831,7 +1831,7 @@ int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
av_log(avctx, AV_LOG_DEBUG, "skip %d samples due to side data\n", av_log(avctx, AV_LOG_DEBUG, "skip %d samples due to side data\n",
avctx->internal->skip_samples); avctx->internal->skip_samples);
} }
if (avctx->internal->skip_samples) { if (avctx->internal->skip_samples && *got_frame_ptr) {
if(frame->nb_samples <= avctx->internal->skip_samples){ if(frame->nb_samples <= avctx->internal->skip_samples){
*got_frame_ptr = 0; *got_frame_ptr = 0;
avctx->internal->skip_samples -= frame->nb_samples; avctx->internal->skip_samples -= frame->nb_samples;