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read_gab2_sub: fix null pointer dereference

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-12-12 14:27:46 +01:00
parent 02b238186a
commit 028cc42a16
1 changed files with 1 additions and 1 deletions

2
libavformat/avidec.c
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@ -817,7 +817,7 @@ static int avi_read_header(AVFormatContext *s)
} }
static int read_gab2_sub(AVStream *st, AVPacket *pkt) { static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) { if (pkt->data && !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
uint8_t desc[256]; uint8_t desc[256];
int score = AVPROBE_SCORE_MAX / 2, ret; int score = AVPROBE_SCORE_MAX / 2, ret;
AVIStream *ast = st->priv_data; AVIStream *ast = st->priv_data;