mac80211: mesh: fix potentially unaligned access

stable inclusion
from stable-5.10.71
commit 8576e72ac5d651c3ef41afc54b657bed7e9a69d7
bugzilla: 182981 https://gitee.com/openeuler/kernel/issues/I4I3KD

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8576e72ac5d651c3ef41afc54b657bed7e9a69d7

--------------------------------

[ Upstream commit b9731062 ]

The pointer here points directly into the frame, so the
access is potentially unaligned. Use get_unaligned_le16
to avoid that.

Fixes: 3f52b7e3 ("mac80211: mesh power save basics")
Link: https://lore.kernel.org/r/20210920154009.3110ff75be0c.Ib6a2ff9e9cc9bc6fca50fce631ec1ce725cc926b@changeidSigned-off-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

net/mac80211/mesh_ps.c

@@ -2,6 +2,7 @@
 /*
  * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
  * Copyright 2012-2013, cozybit Inc.
+ * Copyright (C) 2021 Intel Corporation
  */
 
 #include "mesh.h"
@@ -588,7 +589,7 @@ void ieee80211_mps_frame_release(struct sta_info *sta,
 
 	/* only transmit to PS STA with announced, non-zero awake window */
 	if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
-	    (!elems->awake_window || !le16_to_cpu(*elems->awake_window)))
+	    (!elems->awake_window || !get_unaligned_le16(elems->awake_window)))
 		return;
 
 	if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))