4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jia-Ju Bai <baijiaju1990@xxxxxxx> [ Upstream commit 162bd5e5fd921785077b5862d8f2ffabe2fe11e5 ] The driver may sleep under a spinlock. The function call path is: hwsim_get_radio_nl (acquire the spinlock) nlmsg_new(GFP_KERNEL) --> may sleep To fix it, GFP_KERNEL is replaced with GFP_ATOMIC. This bug is found by my static analysis tool(DSAC) and checked by my code review. Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxx> Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/wireless/mac80211_hwsim.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -3220,7 +3220,7 @@ static int hwsim_get_radio_nl(struct sk_ if (!net_eq(wiphy_net(data->hw->wiphy), genl_info_net(info))) continue; - skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); if (!skb) { res = -ENOMEM; goto out_err;