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MOV: bail out to toplevel when encountering a trak or mdat chunk.

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This patch fixes the sample from trac issue #733.
The issue is that the size of the trak elements is coded
too large, so that the next trak element would be parsed
as part of the first and truncated incorrectly.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2012-03-25 14:13:04 +02:00
parent 2d54bbb950
commit e0ad7f74c7
1 changed files with 10 additions and 0 deletions
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10
libavformat/mov.c
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@ -319,6 +319,16 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
if (atom.size >= 8) {
a.size = avio_rb32(pb);
a.type = avio_rl32(pb);
if (atom.type != MKTAG('r','o','o','t') &&
atom.type != MKTAG('m','o','o','v'))
{
if (a.type == MKTAG('t','r','a','k') || a.type == MKTAG('m','d','a','t'))
{
av_log(c->fc, AV_LOG_ERROR, "Broken file, trak/mdat not at top-level\n");
avio_skip(pb, -8);
return 0;
}
}
total_size += 8;
if (a.size == 1) { /* 64 bit extended size */
a.size = avio_rb64(pb) - 8;