From b3a9f2dfbf2876231870bdbfc7c55c9b92fdd91a Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Tue, 24 Nov 2020 00:22:39 +0100
Subject: [PATCH] avformat/wavdec: Consider AV_INPUT_BUFFER_PADDING_SIZE in
 set_spdif()

The buffer is read by using the bit reader
Fixes: out of array read
Fixes: 27539/clusterfuzz-testcase-minimized-ffmpeg_dem_WAV_fuzzer-5650565572591616

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 0a7c648e2d85a59975cc88079975cf9f3306ed0a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/wavdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index e5a2f00814..119ef6f1a0 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -72,7 +72,7 @@ static void set_spdif(AVFormatContext *s, WAVDemuxContext *wav)
         if (ret < 0)
             goto end;
 
-        buf = av_malloc(len);
+        buf = av_malloc(len + AV_INPUT_BUFFER_PADDING_SIZE);
         if (!buf) {
             ret = AVERROR(ENOMEM);
             goto end;