From dfc4fdedf8cfc56a505579b1f2c1c5efbce4b97e Mon Sep 17 00:00:00 2001
From: Justin Ruggles <justin.ruggles@gmail.com>
Date: Fri, 2 Mar 2012 16:33:33 -0500
Subject: [PATCH] wmaenc: require a large enough output buffer to prevent
 overwrites

The maximum theoretical frame size is around 17000 bytes. Although in
practice it will generally be much smaller, we require a larger buffer
just to be safe.

CC: libav-stable@libav.org
---
 libavcodec/wmaenc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/wmaenc.c b/libavcodec/wmaenc.c
index 99544c0c8a..5135b982aa 100644
--- a/libavcodec/wmaenc.c
+++ b/libavcodec/wmaenc.c
@@ -365,6 +365,11 @@ static int encode_superframe(AVCodecContext *avctx,
         }
     }
 
+    if (buf_size < 2 * MAX_CODED_SUPERFRAME_SIZE) {
+        av_log(avctx, AV_LOG_ERROR, "output buffer size is too small\n");
+        return AVERROR(EINVAL);
+    }
+
 #if 1
     total_gain= 128;
     for(i=64; i; i>>=1){