Fixes: memleak
Fixes: 
15171/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5683881644130304

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/img2dec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index fe45c5e5ec..f8b4a655a5 100644
--- a/libavformat/img2dec.c
+++ b/libavformat/img2dec.c
@@ -356,6 +356,7 @@ int ff_img_read_header(AVFormatContext *s1)
             }
             if (s1->flags & AVFMT_FLAG_CUSTOM_IO) {
                 avio_seek(s1->pb, 0, SEEK_SET);
+                av_freep(&probe_buffer);
             } else
                 ffio_rewind_with_probe_data(s1->pb, &probe_buffer, 
probe_buffer_size);
         }
-- 
2.21.0

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