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-rw-r--r--src/decoder/plugins/MpcdecDecoderPlugin.cxx3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/decoder/plugins/MpcdecDecoderPlugin.cxx b/src/decoder/plugins/MpcdecDecoderPlugin.cxx
index f86cb3c81..d7dab05e0 100644
--- a/src/decoder/plugins/MpcdecDecoderPlugin.cxx
+++ b/src/decoder/plugins/MpcdecDecoderPlugin.cxx
@@ -84,6 +84,9 @@ mpc_getsize_cb(mpc_reader *reader)
struct mpc_decoder_data *data =
(struct mpc_decoder_data *)reader->data;
+ if (!data->is.KnownSize())
+ return -1;
+
return data->is.GetSize();
}