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avformat/swfdec: check avio_read() return code

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Fixes use of uninitialized memory
Fixes part of msan_uninit-mem_7f055dd0ab1b_9558_videopop_guitar_300k.swf
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-12-19 03:50:05 +01:00
parent d2d794f3aa
commit e72f5abbc6
1 changed files with 12 additions and 2 deletions
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14
libavformat/swfdec.c
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@ -455,10 +455,20 @@ bitmap_end_skip:
/* old SWF files containing SOI/EOI as data start */
/* files created by swink have reversed tag */
pkt->size -= 4;
avio_read(pb, pkt->data, pkt->size);
res = avio_read(pb, pkt->data, pkt->size);
} else {
avio_read(pb, pkt->data + 4, pkt->size - 4);
res = avio_read(pb, pkt->data + 4, pkt->size - 4);
if (res >= 0)
res += 4;
}
if (res != pkt->size) {
if (res < 0) {
av_free_packet(pkt);
return res;
}
av_shrink_packet(pkt, res);
}
pkt->pos = pos;
pkt->stream_index = st->index;
return pkt->size;