[FFmpeg-devel] [PATCH 1/7] Check for out of bound writes in the wmavoice decoder.

fenrir at elivagar.org fenrir at elivagar.org
Tue Sep 27 23:43:51 CEST 2011


From: Laurent Aimar <fenrir at videolan.org>

---
 libavcodec/wmavoice.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/libavcodec/wmavoice.c b/libavcodec/wmavoice.c
index 400d963..b2deda4 100644
--- a/libavcodec/wmavoice.c
+++ b/libavcodec/wmavoice.c
@@ -1880,6 +1880,8 @@ static void copy_bits(PutBitContext *pb,
     rmn_bits = rmn_bytes = get_bits_left(gb);
     if (rmn_bits < nbits)
         return;
+    if (nbits > pb->size_in_bits - put_bits_count(pb))
+        return;
     rmn_bits &= 7; rmn_bytes >>= 3;
     if ((rmn_bits = FFMIN(rmn_bits, nbits)) > 0)
         put_bits(pb, rmn_bits, get_bits(gb, rmn_bits));
-- 
1.7.2.5



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