avformat/mov: Check for EOF in mov_read_meta()

Fixes: Timeout (195sec -> 2ms)
Fixes: 16735/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5090676403863552
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavformat/mov.c b/libavformat/mov.c
index cd3f5bffcf1becbf75a8408df3ffbf26cfe5389c..1533c35a1dc8485fb502551e99168eee36d74774 100644 (file)
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -4419,7 +4419,10 @@ static int mov_read_custom(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 {
     while (atom.size > 8) {
-        uint32_t tag = avio_rl32(pb);
+        uint32_t tag;
+        if (avio_feof(pb))
+            return AVERROR_EOF;
+        tag = avio_rl32(pb);
         atom.size -= 4;
         if (tag == MKTAG('h','d','l','r')) {
             avio_seek(pb, -8, SEEK_CUR);