[FFmpeg-cvslog] avcodec/apedec: Check length in long_filter_high_3800()

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michael at niedermayer.cc> | Wed Dec  2 21:16:27 2015 +0100| [ce15d773d4f7a3f224342b5eb9ccad93c71421e6] | committer: Michael Niedermayer

avcodec/apedec: Check length in long_filter_high_3800()

Fixes out of array read
Fixes: 0a7ff0c1d93da9cef28a315ec91b692a/asan_heap-oob_4a52e5_3604_9c56dbb20e308f4faeef7b35f688521a.ape

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit cd7524fdd13dc8d0cf22e2cfd8300a245542b13a)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ce15d773d4f7a3f224342b5eb9ccad93c71421e6
---

 libavcodec/apedec.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 577d0aa..7893bc3 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -905,6 +905,9 @@ static void long_filter_high_3800(int32_t *buffer, int order, int shift,
     int i, j;
     int32_t dotprod, sign;
 
+    if (order >= length)
+        return;
+
     memset(coeffs, 0, order * sizeof(*coeffs));
     for (i = 0; i < order; i++)
         delay[i] = buffer[i];