Fixes: Timeout (>10sec -> 12ms)
Fixes: 
27612/clusterfuzz-testcase-minimized-ffmpeg_dem_PCM_S24BE_fuzzer-6605893000757248

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/id3v2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c
index 336a3964de..97f6cc8a68 100644
--- a/libavformat/id3v2.c
+++ b/libavformat/id3v2.c
@@ -995,6 +995,8 @@ static void id3v2_parse(AVIOContext *pb, AVDictionary 
**metadata,
 
                     if (tlen <= 0)
                         goto seek;
+                    if (dlen / 32768 > tlen)
+                        goto seek;
 
                     av_fast_malloc(&uncompressed_buffer, 
&uncompressed_buffer_size, dlen);
                     if (!uncompressed_buffer) {
-- 
2.17.1

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