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h264_sei: Fix infinite loop.

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Fixes not yet fixed parts of CVE-2011-3946.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-01-26 19:31:01 +01:00
parent fe0089a6ed
commit 9decfc17bb
1 changed files with 4 additions and 0 deletions
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4
libavcodec/h264_sei.c
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@ -169,11 +169,15 @@ int ff_h264_decode_sei(H264Context *h){
type=0;
do{
if (get_bits_left(&s->gb) < 8)
return -1;
type+= show_bits(&s->gb, 8);
}while(get_bits(&s->gb, 8) == 255);
size=0;
do{
if (get_bits_left(&s->gb) < 8)
return -1;
size+= show_bits(&s->gb, 8);
}while(get_bits(&s->gb, 8) == 255);