From: Du Cheng <ducheng2@xxxxxxxxx> commit 1b5ab825d9acc0f27d2f25c6252f3526832a9626 upstream. 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@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Du Cheng <ducheng2@xxxxxxxxx> Link: https://lore.kernel.org/r/20210407162756.6101-1-ducheng2@xxxxxxxxx Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/wireless/sme.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/wireless/sme.c +++ b/net/wireless/sme.c @@ -507,7 +507,7 @@ static int cfg80211_sme_connect(struct w if (wdev->current_bss) return -EALREADY; - if (WARN_ON(wdev->conn)) + if (wdev->conn) return -EINPROGRESS; wdev->conn = kzalloc(sizeof(*wdev->conn), GFP_KERNEL);
