From 60689de46c7f6a0028c8b37b6f03db68cbfad8ed Mon Sep 17 00:00:00 2001
From: Rajkumar Manoharan <rmanohar@codeaurora.org>
Date: Fri, 24 Apr 2020 15:41:39 -0700
Subject: [PATCH] mac80211: fix memory overlap due to variable length param
Git-commit: 60689de46c7f6a0028c8b37b6f03db68cbfad8ed
Patch-mainline: v5.8-rc1
References: jsc#SLE-13430

[ backport note: dropped ath11 chunk as the code is missing in SLE15-SP3
  -- tiwai ]

As of now HE operation element in bss_conf includes variable length
optional field followed by other HE variable. Though the optional
field never be used, actually it is referring to next member of the
bss_conf structure which is not correct. Fix it by declaring needed
HE operation fields within bss_conf itself.

Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
Link: https://lore.kernel.org/r/1587768108-25248-2-git-send-email-rmanohar@codeaurora.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 include/net/mac80211.h |    7 +++++--
 net/mac80211/he.c      |   13 +++++--------
 2 files changed, 10 insertions(+), 10 deletions(-)

--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -604,7 +604,7 @@ struct ieee80211_ftm_responder_params {
  *	nontransmitted BSSIDs
  * @profile_periodicity: the least number of beacon frames need to be received
  *	in order to discover all the nontransmitted BSSIDs in the set.
- * @he_operation: HE operation information of the AP we are connected to
+ * @he_oper: HE operation information of the AP we are connected to
  * @he_obss_pd: OBSS Packet Detection parameters.
  * @he_bss_color: BSS coloring settings, if BSS supports HE
  */
@@ -668,7 +668,10 @@ struct ieee80211_bss_conf {
 	u8 bssid_indicator;
 	bool ema_ap;
 	u8 profile_periodicity;
-	struct ieee80211_he_operation he_operation;
+	struct {
+		u32 params;
+		u16 nss_set;
+	} he_oper;
 	struct ieee80211_he_obss_pd he_obss_pd;
 	struct cfg80211_he_bss_color he_bss_color;
 };
--- a/net/mac80211/he.c
+++ b/net/mac80211/he.c
@@ -105,17 +105,14 @@ ieee80211_he_cap_ie_to_sta_he_cap(struct
 
 void
 ieee80211_he_op_ie_to_bss_conf(struct ieee80211_vif *vif,
-			const struct ieee80211_he_operation *he_op_ie_elem)
+			const struct ieee80211_he_operation *he_op_ie)
 {
-	struct ieee80211_he_operation *he_operation =
-					&vif->bss_conf.he_operation;
-
-	if (!he_op_ie_elem) {
-		memset(he_operation, 0, sizeof(*he_operation));
+	memset(&vif->bss_conf.he_oper, 0, sizeof(vif->bss_conf.he_oper));
+	if (!he_op_ie)
 		return;
-	}
 
-	vif->bss_conf.he_operation = *he_op_ie_elem;
+	vif->bss_conf.he_oper.params = __le32_to_cpu(he_op_ie->he_oper_params);
+	vif->bss_conf.he_oper.nss_set = __le16_to_cpu(he_op_ie->he_mcs_nss_set);
 }
 
 void