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avcodec/mpegvideo_enc: check that max_b_frames is not negative 

Fixes crash found by saste
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-10-29 16:12:01 +01:00
parent 6103faaa51
commit ce55e667fa
1 changed files with 5 additions and 0 deletions
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5
libavcodec/mpegvideo_enc.c
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@ -452,6 +452,11 @@ av_cold int ff_MPV_encode_init(AVCodecContext *avctx)
av_log(avctx, AV_LOG_ERROR, "b frames not supported by codec\n");
return -1;
}
if (s->max_b_frames < 0) {
av_log(avctx, AV_LOG_ERROR,
"max b frames must be 0 or postive for mpegvideo based encoders\n");
return -1;
}
if ((s->codec_id == AV_CODEC_ID_MPEG4 ||
s->codec_id == AV_CODEC_ID_H263 ||