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mtv: improve header check and avoid division by zero

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CC: libav-stable@libav.org
Bug-Id: CID 732203 / CID 732204
This commit is contained in:
Vittorio Giovara 2014-10-24 13:15:36 +01:00
parent b3d11437ca
commit f64d7e919e
1 changed files with 5 additions and 2 deletions
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7
libavformat/mtv.c
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@ -96,14 +96,17 @@ static int mtv_read_header(AVFormatContext *s)
/* Calculate width and height if missing from header */
if(!mtv->img_width)
if (!mtv->img_width && mtv->img_height > 0 && mtv->img_bpp >= 8)
mtv->img_width=mtv->img_segment_size / (mtv->img_bpp>>3)
/ mtv->img_height;
if(!mtv->img_height)
if (!mtv->img_height && mtv->img_width > 0 && mtv->img_bpp >= 8)
mtv->img_height=mtv->img_segment_size / (mtv->img_bpp>>3)
/ mtv->img_width;
if (!mtv->img_width || !mtv->img_height)
return AVERROR_INVALIDDATA;
avio_skip(pb, 4);
audio_subsegments = avio_rl16(pb);