Fixes: memleak
Fixes: 
67442/clusterfuzz-testcase-minimized-ffmpeg_dem_CAF_fuzzer-5068813261406208

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

diff --git a/libavformat/isom.c b/libavformat/isom.c
index 9fbccd4437f..c5930bd4d87 100644
--- a/libavformat/isom.c
+++ b/libavformat/isom.c
@@ -359,6 +359,7 @@ int ff_mp4_read_dec_config_descr(AVFormatContext *fc, 
AVStream *st, AVIOContext
                                                 st->codecpar->extradata_size, 
1, fc);
             if (ret < 0)
                 return ret;
+            av_channel_layout_uninit(&st->codecpar->ch_layout);
             st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
             st->codecpar->ch_layout.nb_channels = cfg.channels;
             if (cfg.object_type == 29 && cfg.sampling_index < 3) // old mp3on4
-- 
2.17.1

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