From 69754e07f5133b20bc789c7dea5d05714f63bf7f Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sat, 12 Dec 2020 00:41:17 +0100
Subject: [PATCH] avformat/wtvdec: Check for EOF before potentially reseting
 the eof state

Fixes: infinite loop
Fixes: 28042/clusterfuzz-testcase-minimized-ffmpeg_dem_WTV_fuzzer-6311288967528448

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/wtvdec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/wtvdec.c b/libavformat/wtvdec.c
index 77908e6392..6c41e3c1a3 100644
--- a/libavformat/wtvdec.c
+++ b/libavformat/wtvdec.c
@@ -953,6 +953,9 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
         } else
             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
 
+        if (avio_feof(pb))
+            break;
+
         avio_skip(pb, WTV_PAD8(len) - consumed);
     }
     return AVERROR_EOF;