[FFmpeg-cvslog] Avoid a null pointer dereference on oom when decoding vc1.

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <cehoyos at ag.or.at> | Sat Jun 29 14:49:47 2013 +0200| [ac83d621363ca8899b90e65cb574946704bfcdec] | committer: Carl Eugen Hoyos

Avoid a null pointer dereference on oom when decoding vc1.

Fixes ticket #2723.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ac83d621363ca8899b90e65cb574946704bfcdec
---

 libavcodec/vc1dec.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index b796b3d..88f3ca2 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -5784,6 +5784,8 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
     if (avctx->codec_id == AV_CODEC_ID_VC1 || avctx->codec_id == AV_CODEC_ID_VC1IMAGE) {
         int buf_size2 = 0;
         buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+        if (!buf2)
+            return AVERROR(ENOMEM);
 
         if (IS_MARKER(AV_RB32(buf))) { /* frame starts with marker and needs to be parsed */
             const uint8_t *start, *end, *next;