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mov: Fix negative size calculation in mov_read_default().

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The previous code assumed if an atom was marked with a 64-bit
size extension, it actually had that data available. The new
code verfies there's enough data in the atom for this to be
done.

Failure to verify causes total_size > atom.size which will
result in negative size calculations later on.

Found-by: Paul Mehta <paul@paulmehta.com>
Signed-off-by: Dale Curtis <dalecurtis@chromium.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 3ebd76a9c5)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Dale Curtis 2015-01-05 16:34:17 -08:00 committed by Michael Niedermayer
parent 25312a427b
commit 0ce35b8ce8
1 changed files with 1 additions and 1 deletions
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2
libavformat/mov.c
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@ -3431,7 +3431,7 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
}
}
total_size += 8;
if (a.size == 1) { /* 64 bit extended size */
if (a.size == 1 && total_size + 8 <= atom.size) { /* 64 bit extended size */
a.size = avio_rb64(pb) - 8;
total_size += 8;
}