[FFmpeg-cvslog] interplayacm: increase bitstream buffer size by AV_INPUT_BUFFER_PADDING_SIZE

[Andreas Cadhalpun]

ffmpeg | branch: release/3.2 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Sun Oct 30 21:18:20 2016 +0100| [6e5ccabbe8461f5bde1c8ad87a2ced343fd2e5b7] | committer: Andreas Cadhalpun

interplayacm: increase bitstream buffer size by AV_INPUT_BUFFER_PADDING_SIZE

This fixes out-of-bounds reads by the bitstream reader.

Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit 60178e78f2fe9a7bfb9da0abc985835e2ebfd2f1)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6e5ccabbe8461f5bde1c8ad87a2ced343fd2e5b7
---

 libavcodec/interplayacm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/interplayacm.c b/libavcodec/interplayacm.c
index 0320531..c897e72 100644
--- a/libavcodec/interplayacm.c
+++ b/libavcodec/interplayacm.c
@@ -77,7 +77,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     s->block   = av_calloc(s->block_len, sizeof(int));
     s->wrapbuf = av_calloc(s->wrapbuf_len, sizeof(int));
     s->ampbuf  = av_calloc(0x10000, sizeof(int));
-    s->bitstream = av_calloc(s->max_framesize, sizeof(*s->bitstream));
+    s->bitstream = av_calloc(s->max_framesize + AV_INPUT_BUFFER_PADDING_SIZE / sizeof(*s->bitstream) + 1, sizeof(*s->bitstream));
     if (!s->block || !s->wrapbuf || !s->ampbuf || !s->bitstream)
         return AVERROR(ENOMEM);