avcodec/wmalosslessdec: Fix integer overflow with sliding in padding bits

[ffmpeg] / libavcodec / lagarith.c

diff --git a/libavcodec/lagarith.c b/libavcodec/lagarith.c
index 59169be5dea5231324fd8149f333ae02d6df1059..0a45812bc14f38c481f2d316976e8e0cd1579854 100644 (file)
--- a/libavcodec/lagarith.c
+++ b/libavcodec/lagarith.c
@@ -226,6 +226,9 @@ static int lag_read_prob_header(lag_rac *rac, GetBitContext *gb)
         }
     }
 
+    if (scale_factor > 23)
+        return AVERROR_INVALIDDATA;
+
     rac->scale = scale_factor;
 
     /* Fill probability array with cumulative probability for each symbol. */