[FFmpeg-cvslog] avcodec/wmaenc: Check ff_wma_init() for failure

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michael at niedermayer.cc> | Thu Jan 21 02:38:05 2016 +0100| [9e44ea7c0f3984252dc9f8484e81d9d01168a5a8] | committer: Michael Niedermayer

avcodec/wmaenc: Check ff_wma_init() for failure

Fixes null pointer dereference
Fixes: c4faf8280ba366bf00a79d425f2910a8/signal_sigsegv_1f96477_5177_1448ba7e4125faceb966f44ceb69abfa.qcp
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 19e456d48c90a1e3ceeb9e6241383384cc73dfdf)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9e44ea7c0f3984252dc9f8484e81d9d01168a5a8
---

 libavcodec/wmaenc.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/wmaenc.c b/libavcodec/wmaenc.c
index dfa4ad9..18e3706 100644
--- a/libavcodec/wmaenc.c
+++ b/libavcodec/wmaenc.c
@@ -32,6 +32,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
     WMACodecContext *s = avctx->priv_data;
     int i, flags1, flags2, block_align;
     uint8_t *extradata;
+    int ret;
 
     s->avctx = avctx;
 
@@ -78,7 +79,8 @@ static av_cold int encode_init(AVCodecContext *avctx)
     if (avctx->channels == 2)
         s->ms_stereo = 1;
 
-    ff_wma_init(avctx, flags2);
+    if ((ret = ff_wma_init(avctx, flags2)) < 0)
+        return ret;
 
     /* init MDCT */
     for (i = 0; i < s->nb_block_sizes; i++)