sanity checks (should prevent hypothetical div by zero issue)

should fix sf bug #1547313

Originally committed as revision 9164 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 5 insertions, 0 deletions

diff --git a/libavcodec/wma.c b/libavcodec/wma.c
index 2241a07a0e..1f1495e6ef 100644
--- a/libavcodec/wma.c
+++ b/libavcodec/wma.c
@@ -72,6 +72,11 @@ int ff_wma_init(AVCodecContext * avctx, int flags2)
     int sample_rate1;
     int coef_vlc_table;
 
+    if(   avctx->sample_rate<=0 || avctx->sample_rate>50000
+       || avctx->channels<=0 || avctx->channels>8
+       || avctx->bit_rate<=0)
+        return -1;
+
     s->sample_rate = avctx->sample_rate;
     s->nb_channels = avctx->channels;
     s->bit_rate = avctx->bit_rate;