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wtvdec: Check that stream private context has been allocated before use. 

This fixes a null ptr dereference with attachments

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-22 15:29:34 +02:00
parent 9a4f5b7616
commit fd2127ad53
1 changed files with 1 additions and 1 deletions
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2
libavformat/wtvdec.c
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@ -833,7 +833,7 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
}
} else if (!ff_guidcmp(g, ff_data_guid)) {
int stream_index = ff_find_stream_index(s, sid);
if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
WtvStream *wst = s->streams[stream_index]->priv_data;
wst->seen_data = 1;
if (len_ptr) {