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dv: check buffer size before reading profile. 

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Ronald S. Bultje 2012-03-07 13:48:41 -08:00
parent 6e2821160b
commit e97efecec8
1 changed files with 5 additions and 3 deletions
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8
libavcodec/dvdata.c
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@ -286,11 +286,13 @@ static const DVprofile dv_profiles[] = {
const DVprofile* avpriv_dv_frame_profile(const DVprofile *sys,
const uint8_t* frame, unsigned buf_size)
{
int i;
int i, dsf, stype;
int dsf = (frame[3] & 0x80) >> 7;
if (buf_size < 80*5 + 48 + 4)
return NULL;
int stype = frame[80*5 + 48 + 3] & 0x1f;
dsf = (frame[3] & 0x80) >> 7;
stype = frame[80*5 + 48 + 3] & 0x1f;
/* 576i50 25Mbps 4:1:1 is a special case */
if (dsf == 1 && stype == 0 && frame[4] & 0x07 /* the APT field */) {