netdev - [PATCH] mac80211: fix potential deadlock in ieee80211_key

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Date:   Sat, 27 Aug 2022 10:24:52 +0800
From:   Sun Ke <sunke32@...wei.com>
To:     <johannes@...solutions.net>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>
CC:     <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>, <johannes.berg@...el.com>,
        <sunke32@...wei.com>
Subject: [PATCH] mac80211: fix potential deadlock in ieee80211_key_link()

Add the missing unlock before return in the error handling case.

Fixes: ccdde7c74ffd ("wifi: mac80211: properly implement MLO key handling")
Signed-off-by: Sun Ke <sunke32@...wei.com>
---
 net/mac80211/key.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 86aac87e0211..d89ec93b243b 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -865,8 +865,10 @@ int ieee80211_key_link(struct ieee80211_key *key,
 		if (link_id >= 0) {
 			link_sta = rcu_dereference_protected(sta->link[link_id],
 							     lockdep_is_held(&sta->local->sta_mtx));
-			if (!link_sta)
-				return -ENOLINK;
+			if (!link_sta) {
+				ret = -ENOLINK;
+				goto out;
+			}
 		}
 
 		old_key = key_mtx_dereference(sdata->local, link_sta->gtk[idx]);
-- 
2.31.1