[FFmpeg-cvslog] avcodec/vp3: Check eob_run

[Michael Niedermayer]

ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Fri Feb  9 04:17:16 2018 +0100| [0ff1825ea354ae145110bd80401cf76a306d7fde] | committer: Michael Niedermayer

avcodec/vp3: Check eob_run

Fixes: out of array access
Fixes: 5919/clusterfuzz-testcase-minimized-5859311382167552
Fixes: special case for theora (untested due to lack of sample)

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 570023eab3e2962b4ad8345a157c1e18ca1a6eca)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0ff1825ea354ae145110bd80401cf76a306d7fde
---

 libavcodec/vp3.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index f167acf4ee..fdffc88486 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -978,6 +978,9 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
             if (eob_run_get_bits[token])
                 eob_run += get_bits(gb, eob_run_get_bits[token]);
 
+            if (!eob_run)
+                eob_run = INT_MAX;
+
             // record only the number of blocks ended in this plane,
             // any spill will be recorded in the next plane.
             if (eob_run > num_coeffs - coeff_i) {