From: Jouni Malinen <j@w1.fi>
Date: Sat, 11 Oct 2008 00:29:55 +0000 (+0300)
Subject: mac80211: Fix scan RX processing oops
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d048e503a2b01e771ee87921c24d89d7ec3f0c2f;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

mac80211: Fix scan RX processing oops

ieee80211_bss_info_update() can return NULL. Verify that this is not the
case before calling ieee802111_rx_bss_put() which would trigger an oops
in interrupt context in atomic_dec_and_lock().

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benoit Papillault <benoit.papillault@free.fr>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 8e6685e7ae85..416bb41099f3 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -388,7 +388,8 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 	bss = ieee80211_bss_info_update(sdata->local, rx_status,
 					mgmt, skb->len, &elems,
 					freq, beacon);
-	ieee80211_rx_bss_put(sdata->local, bss);
+	if (bss)
+		ieee80211_rx_bss_put(sdata->local, bss);
 
 	dev_kfree_skb(skb);
 	return RX_QUEUED;