From 48f1e5212c90b511c90fa0449655abb06a9edda2 Mon Sep 17 00:00:00 2001
From: Alex Converse <alex.converse@gmail.com>
Date: Fri, 27 Jan 2012 14:24:07 -0800
Subject: wmadec: Verify bitstream size makes sense before calling
 init_get_bits.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
---
 libavcodec/wmadec.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'libavcodec/wmadec.c')

diff --git a/libavcodec/wmadec.c b/libavcodec/wmadec.c
index 5600f9ba90..41b2a8e7a7 100644
--- a/libavcodec/wmadec.c
+++ b/libavcodec/wmadec.c
@@ -873,6 +873,8 @@ static int wma_decode_superframe(AVCodecContext *avctx, void *data,
 
         /* read each frame starting from bit_offset */
         pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
+        if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8)
+            return AVERROR_INVALIDDATA;
         init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3))*8);
         len = pos & 7;
         if (len > 0)
-- 
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