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avformat/avidec: Check nb_streams in read_gab2_sub() 

Fixes null pointer dereference
Fixes: 1/null_point.avi

Found-by: 连一汉 <lianyihan@360.cn>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2679ad4773)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-09-28 16:14:08 +02:00
parent b490cf4350
commit 45f5e17aa4
1 changed files with 2 additions and 0 deletions
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2
libavformat/avidec.c
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@ -1057,6 +1057,8 @@ static int read_gab2_sub(AVStream *st, AVPacket *pkt)
ast->sub_ctx->pb = pb;
if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
if (ast->sub_ctx->nb_streams != 1)
goto error;
ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
*st->codec = *ast->sub_ctx->streams[0]->codec;
ast->sub_ctx->streams[0]->codec->extradata = NULL;