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avformat/mov: Check that we have a stream before accessing it in mov_read_ares()

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Fixes out of array read
Fixes: signal_sigsegv_6f1855_3910_avid_test_alpha.mov

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-11-22 20:09:03 +01:00
parent 64821f5a7c
commit a7f27453f6
1 changed files with 11 additions and 9 deletions
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20
libavformat/mov.c
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@ -1042,15 +1042,17 @@ static int mov_read_targa_y216(MOVContext *c, AVIOContext *pb, MOVAtom atom)
static int mov_read_ares(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVCodecContext *codec = c->fc->streams[c->fc->nb_streams-1]->codec;
if (codec->codec_tag == MKTAG('A', 'V', 'i', 'n') &&
codec->codec_id == AV_CODEC_ID_H264 &&
atom.size > 11) {
avio_skip(pb, 10);
/* For AVID AVCI50, force width of 1440 to be able to select the correct SPS and PPS */
if (avio_rb16(pb) == 0xd4d)
codec->width = 1440;
return 0;
if (c->fc->nb_streams >= 1) {
AVCodecContext *codec = c->fc->streams[c->fc->nb_streams-1]->codec;
if (codec->codec_tag == MKTAG('A', 'V', 'i', 'n') &&
codec->codec_id == AV_CODEC_ID_H264 &&
atom.size > 11) {
avio_skip(pb, 10);
/* For AVID AVCI50, force width of 1440 to be able to select the correct SPS and PPS */
if (avio_rb16(pb) == 0xd4d)
codec->width = 1440;
return 0;
}
}
return mov_read_avid(c, pb, atom);