[FFmpeg-cvslog] avcodec/atrac3: Check for huge block aligns

[Michael Niedermayer]

ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Sun Oct 20 23:51:58 2019 +0200| [ed04ecd2d3c3b6dcd7ff31564d93ebe7567fa6ce] | committer: Michael Niedermayer

avcodec/atrac3: Check for huge block aligns

The largest documented frame size = block align is 1024 bytes
(https://wiki.multimedia.cx/index.php/ATRAC3)

Without a limit this can allocate arbitrary memory and trigger OOM
Fixes: OOM
Fixes: 18337/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ATRAC3_fuzzer-5763861478637568
Fixes: 18556/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ATRAC3AL_fuzzer-5646183334936576

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 f09151fff9c754fbc1d2560adf18b14957f8b181)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ed04ecd2d3c3b6dcd7ff31564d93ebe7567fa6ce
---

 libavcodec/atrac3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/atrac3.c b/libavcodec/atrac3.c
index dc19a3863e..067aa23f1f 100644
--- a/libavcodec/atrac3.c
+++ b/libavcodec/atrac3.c
@@ -964,7 +964,7 @@ static av_cold int atrac3_decode_init(AVCodecContext *avctx)
         return AVERROR_INVALIDDATA;
     }
 
-    if (avctx->block_align >= UINT_MAX / 2 || avctx->block_align <= 0)
+    if (avctx->block_align > 1024 || avctx->block_align <= 0)
         return AVERROR(EINVAL);
 
     q->decoded_bytes_buffer = av_mallocz(FFALIGN(avctx->block_align, 4) +