diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 80194b557a0cff8f3d2aba52f06cfc348212abf8..2ecb4deddb5df0ca74eb9630de15bbc9c789f274 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -195,7 +195,7 @@ static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
 static ssize_t sta_agg_status_write(struct file *file, const char __user *userbuf,
 				    size_t count, loff_t *ppos)
 {
-	char _buf[12], *buf = _buf;
+	char _buf[12] = {}, *buf = _buf;
 	struct sta_info *sta = file->private_data;
 	bool start, tx;
 	unsigned long tid;