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4xmdemux: Check chunk size

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Fixes over reading the header array

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 474e31c904f766b6989fe614c3fb093e697c847f)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-16 14:30:33 +02:00
parent f73106256d
commit 5e3cd42b6d
1 changed files with 4 additions and 0 deletions
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4
libavformat/4xm.c
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@ -127,6 +127,10 @@ static int fourxm_read_header(AVFormatContext *s,
for (i = 0; i < header_size - 8; i++) {
fourcc_tag = AV_RL32(&header[i]);
size = AV_RL32(&header[i + 4]);
if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) {
av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8);
return AVERROR_INVALIDDATA;
}
if (fourcc_tag == std__TAG) {
fourxm->fps = av_int2flt(AV_RL32(&header[i + 12]));