From: YueHaibing Date: Fri, 27 Aug 2021 14:42:30 +0000 (+0800) Subject: mac80211: Drop frames from invalid MAC address in ad-hoc mode X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2db11e4501fb078acb1e0aaf54f308a691e3156d;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git mac80211: Drop frames from invalid MAC address in ad-hoc mode [ Upstream commit a6555f844549cd190eb060daef595f94d3de1582 ] WARNING: CPU: 1 PID: 9 at net/mac80211/sta_info.c:554 sta_info_insert_rcu+0x121/0x12a0 Modules linked in: CPU: 1 PID: 9 Comm: kworker/u8:1 Not tainted 5.14.0-rc7+ #253 Workqueue: phy3 ieee80211_iface_work RIP: 0010:sta_info_insert_rcu+0x121/0x12a0 ... Call Trace: ieee80211_ibss_finish_sta+0xbc/0x170 ieee80211_ibss_work+0x13f/0x7d0 ieee80211_iface_work+0x37a/0x500 process_one_work+0x357/0x850 worker_thread+0x41/0x4d0 If an Ad-Hoc node receives packets with invalid source MAC address, it hits a WARN_ON in sta_info_insert_check(), this can spam the log. Signed-off-by: YueHaibing Link: https://lore.kernel.org/r/20210827144230.39944-1-yuehaibing@huawei.com Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index b40e71a5d795..3dc370ad23bf 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -3692,7 +3692,8 @@ static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) if (!bssid) return false; if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || - ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2)) + ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2) || + !is_valid_ether_addr(hdr->addr2)) return false; if (ieee80211_is_beacon(hdr->frame_control)) return true;