cfg80211: remove WARN_ON() in cfg80211_sme_connect

A WARN_ON(wdev->conn) would trigger in cfg80211_sme_connect(), if multiple
send_msg(NL80211_CMD_CONNECT) system calls are made from the userland, which
should be anticipated and handled by the wireless driver. Remove this WARN_ON()
to prevent kernel panic if kernel is configured to "panic_on_warn".

Bug reported by syzbot.

Reported-by: syzbot+5f9392825de654244975@syzkaller.appspotmail.com
Signed-off-by: Du Cheng <ducheng2@gmail.com>
Link: https://lore.kernel.org/r/20210407162756.6101-1-ducheng2@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index 07756ca..08a70b4 100644 (file)
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -529,7 +529,7 @@ static int cfg80211_sme_connect(struct wireless_dev *wdev,
                cfg80211_sme_free(wdev);
        }
 
-       if (WARN_ON(wdev->conn))
+       if (wdev->conn)
                return -EINPROGRESS;
 
        wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);