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gxf: avoid null ptr deref without streams.

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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 2012-11-11 20:57:45 +01:00
parent c871244306
commit 5aedee4fac
1 changed files with 3 additions and 2 deletions
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5
libavformat/gxf.c
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@ -270,15 +270,16 @@ static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si
*/
static void gxf_read_index(AVFormatContext *s, int pkt_len) {
AVIOContext *pb = s->pb;
AVStream *st = s->streams[0];
AVStream *st;
uint32_t fields_per_map = avio_rl32(pb);
uint32_t map_cnt = avio_rl32(pb);
int i;
pkt_len -= 8;
if (s->flags & AVFMT_FLAG_IGNIDX) {
if ((s->flags & AVFMT_FLAG_IGNIDX) || !s->streams) {
avio_skip(pb, pkt_len);
return;
}
st = s->streams[0];
if (map_cnt > 1000) {
av_log(s, AV_LOG_ERROR, "too many index entries %u (%x)\n", map_cnt, map_cnt);
map_cnt = 1000;