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omadec: Properly check lengths before incrementing the position

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit 342c43d154)
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Martin Storsjö 2013-09-11 14:54:05 +03:00 committed by Luca Barbato
parent 557df77eab
commit 9eba02d5dd
1 changed files with 5 additions and 1 deletions
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6
libavformat/omadec.c
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@ -170,7 +170,11 @@ static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
taglen = AV_RB32(&enc_header[pos+32]);
datalen = AV_RB32(&enc_header[pos+36]) >> 4;
pos += 44 + taglen;
pos += 44;
if (size - pos < taglen)
return -1;
pos += taglen;
if (datalen << 4 > size - pos)
return -1;