[FFmpeg-cvslog] avcodec/vp8: Check for bitstream end before vp7_fade_frame()

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sat Feb 17 04:20:52 2018 +0100| [603d23ffebdd6891167ad6c439e27517e7227a9d] | committer: Michael Niedermayer

avcodec/vp8: Check for bitstream end before vp7_fade_frame()

Fixes: Timeout
Fixes: 5653/clusterfuzz-testcase-5497680018014208

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 de675648cef7e451ca82fabaee0d8ec1fe653311)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=603d23ffebdd6891167ad6c439e27517e7227a9d
---

 libavcodec/vp8.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index da28032d9f..3adecba2f0 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -605,6 +605,8 @@ static int vp7_decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_si
             s->fade_present = vp8_rac_get(c);
     }
 
+    if (c->end <= c->buffer && c->bits >= 0)
+        return AVERROR_INVALIDDATA;
     /* E. Fading information for previous frame */
     if (s->fade_present && vp8_rac_get(c)) {
         if ((ret = vp7_fade_frame(s ,c)) < 0)