From 2ffb0598dbdb81c40650952aa9299fa02fa5e834 Mon Sep 17 00:00:00 2001
From: Vittorio Giovara <vittorio.giovara@gmail.com>
Date: Tue, 11 Nov 2014 17:40:06 +0100
Subject: [PATCH] mlpdec: check for negative index

CC: libav-stable@libav.org
Bug-Id: CID 970924
---
 libavcodec/mlpdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c
index 6baf4c1c90..624efc152e 100644
--- a/libavcodec/mlpdec.c
+++ b/libavcodec/mlpdec.c
@@ -552,7 +552,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
             ch_assign = av_get_channel_layout_channel_index(s->ch_layout,
                                                             channel);
         }
-        if (ch_assign > s->max_matrix_channel) {
+        if (ch_assign < 0 || ch_assign > s->max_matrix_channel) {
             avpriv_request_sample(m->avctx,
                                   "Assignment of matrix channel %d to invalid output channel %d",
                                   ch, ch_assign);