[FFmpeg-cvslog] wmadec: prevent null pointer call.

[Michael Niedermayer]

ffmpeg | branch: oldabi | Michael Niedermayer <michaelni at gmx.at> | Mon Apr 25 16:16:44 2011 +0200| [7157334c375b7623dd52314d45cef3700896d0fe] | committer: Michael Niedermayer

wmadec: prevent null pointer call.
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7157334c375b7623dd52314d45cef3700896d0fe
---

 libavcodec/wmadec.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/libavcodec/wmadec.c b/libavcodec/wmadec.c
index 5382999..fa20bea 100644
--- a/libavcodec/wmadec.c
+++ b/libavcodec/wmadec.c
@@ -489,6 +489,11 @@ static int wma_decode_block(WMACodecContext *s)
         s->block_len_bits = s->frame_len_bits;
     }
 
+    if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
+        av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
+        return -1;
+    }
+
     /* now check if the block length is coherent with the frame length */
     s->block_len = 1 << s->block_len_bits;
     if ((s->block_pos + s->block_len) > s->frame_len){