[FFmpeg-cvslog] avcodec/magicyuv: Check len to be supported

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun May  7 14:53:31 2017 +0200| [2162b862eba5aadb59c0cf7cc304c67f4a5fb946] | committer: Michael Niedermayer

avcodec/magicyuv: Check len to be supported

Fixes: shift exponent -1 is negative
Fixes: 1390/clusterfuzz-testcase-minimized-5452757630713856

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2162b862eba5aadb59c0cf7cc304c67f4a5fb946
---

 libavcodec/magicyuv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/magicyuv.c b/libavcodec/magicyuv.c
index 6250536da6..5f09c0be53 100644
--- a/libavcodec/magicyuv.c
+++ b/libavcodec/magicyuv.c
@@ -97,6 +97,8 @@ static int huff_build10(VLC *vlc, uint8_t *len)
     for (i = 0; i < 1024; i++) {
         he[i].sym = 1023 - i;
         he[i].len = len[i];
+        if (len[i] == 0)
+            return AVERROR_INVALIDDATA;
     }
     AV_QSORT(he, 1024, HuffEntry, huff_cmp_len10);
 
@@ -127,6 +129,8 @@ static int huff_build(VLC *vlc, uint8_t *len)
     for (i = 0; i < 256; i++) {
         he[i].sym = 255 - i;
         he[i].len = len[i];
+        if (len[i] == 0)
+            return AVERROR_INVALIDDATA;
     }
     AV_QSORT(he, 256, HuffEntry, huff_cmp_len);