[FFmpeg-cvslog] avformat/wavdec: Consider AV_INPUT_BUFFER_PADDING_SIZE in set_spdif()

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Tue Nov 24 00:22:39 2020 +0100| [8a88150ffcf4dd39e65d97811fcd6269f0306eb7] | committer: Michael Niedermayer

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 at niedermayer.cc>
(cherry picked from commit 0a7c648e2d85a59975cc88079975cf9f3306ed0a)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8a88150ffcf4dd39e65d97811fcd6269f0306eb7
---

 libavformat/wavdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index 703a98414d..309bb6573e 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -69,7 +69,7 @@ static void set_spdif(AVFormatContext *s, WAVDemuxContext *wav)
         int ret = ffio_ensure_seekback(s->pb, len);
 
         if (ret >= 0) {
-            uint8_t *buf = av_malloc(len);
+            uint8_t *buf = av_malloc(len + AV_INPUT_BUFFER_PADDING_SIZE);
             if (!buf) {
                 ret = AVERROR(ENOMEM);
             } else {