wma: Check channel number before init.

Fixes Ticket240

Based on patch by ami_stuff
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 5 insertions, 0 deletions

diff --git a/libavcodec/wmadec.c b/libavcodec/wmadec.c
index bf6e7ee71e..40315d4291 100644
--- a/libavcodec/wmadec.c
+++ b/libavcodec/wmadec.c
@@ -109,6 +109,11 @@ static int wma_decode_init(AVCodecContext * avctx)
         }
     }
 
+    if(avctx->channels > MAX_CHANNELS){
+        av_log(avctx, AV_LOG_ERROR, "Invalid number of channels (%d)\n", avctx->channels);
+        return -1;
+    }
+
     if(ff_wma_init(avctx, flags2)<0)
         return -1;