[FFmpeg-cvslog] avcodec/mjpegenc_huffman: Assert length in ff_mjpegenc_huffman_compute_bits()

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Sat Apr  8 03:34:44 2017 +0200| [0c188bc595c1ebcfaf3e0314df1cad30446851d2] | committer: Michael Niedermayer

avcodec/mjpegenc_huffman: Assert length in ff_mjpegenc_huffman_compute_bits()

This should help coverity see that the issues this leads to cannot occur

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 8dd0c12648d838bb982ca10f384ee1f0107dfece)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0c188bc595c1ebcfaf3e0314df1cad30446851d2
---

 libavcodec/mjpegenc_huffman.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/mjpegenc_huffman.c b/libavcodec/mjpegenc_huffman.c
index ebf1311466..0e63f8066b 100644
--- a/libavcodec/mjpegenc_huffman.c
+++ b/libavcodec/mjpegenc_huffman.c
@@ -87,6 +87,8 @@ void ff_mjpegenc_huffman_compute_bits(PTable *prob_table, HuffTable *distincts,
 
     int min;
 
+    av_assert0(max_length > 0);
+
     to->nitems = 0;
     from->nitems = 0;
     to->item_idx[0] = 0;