[FFmpeg-cvslog] avcodec/alac: Check for bps of 0

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Aug  9 01:23:49 2019 +0200| [8f49176e845fee8e4e0aaf06411636b46d1ae3ad] | committer: Michael Niedermayer

avcodec/alac: Check for bps of 0

Fixes: shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes: 15764/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5102101203517440

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: James Almer <jamrial at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8f49176e845fee8e4e0aaf06411636b46d1ae3ad
---

 libavcodec/alac.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/alac.c b/libavcodec/alac.c
index 6086e2caa8..782d461b22 100644
--- a/libavcodec/alac.c
+++ b/libavcodec/alac.c
@@ -250,10 +250,12 @@ static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
 
     alac->extra_bits = get_bits(&alac->gb, 2) << 3;
     bps = alac->sample_size - alac->extra_bits + channels - 1;
-    if (bps > 32U) {
+    if (bps > 32) {
         avpriv_report_missing_feature(avctx, "bps %d", bps);
         return AVERROR_PATCHWELCOME;
     }
+    if (bps < 1)
+        return AVERROR_INVALIDDATA;
 
     /* whether the frame is compressed */
     is_compressed = !get_bits1(&alac->gb);