Fixes: timeout in 730/clusterfuzz-testcase-5265113739165696 (part 2 of 2)

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/vp8.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index a3d057d62e..6759b310f0 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -2330,6 +2330,8 @@ static av_always_inline int 
decode_mb_row_no_filter(AVCodecContext *avctx, void
     s->mv_max.x = ((s->mb_width - 1) << 6) + MARGIN;
 
     for (mb_x = 0; mb_x < s->mb_width; mb_x++, mb_xy++, mb++) {
+        if (c->end <= c->buffer && c->bits >= 0)
+            return AVERROR_INVALIDDATA;
         // Wait for previous thread to read mb_x+2, and reach mb_y-1.
         if (prev_td != td) {
             if (threadnr != 0) {
-- 
2.11.0

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