Fixes: Timeout (148sec -> 0.1sec)
Fixes: 
18427/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5682124627116032

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

diff --git a/libavformat/vividas.c b/libavformat/vividas.c
index efe1b8deff..049414a413 100644
--- a/libavformat/vividas.c
+++ b/libavformat/vividas.c
@@ -295,6 +295,8 @@ static int track_header(VividasDemuxContext *viv, 
AVFormatContext *s,  uint8_t *
     for (i=0;i<val_1;i++) {
         int c = avio_r8(pb);
         for (j=0;j<c;j++) {
+            if (avio_feof(pb))
+                return AVERROR_EOF;
             avio_r8(pb); // val_3
             avio_r8(pb); // val_4
         }
-- 
2.23.0

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