linux-kernel - [PATCH 5.4 09/63] cfg80211: hold bss_lock while updating nontrans

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Message-Id: <20220418121134.779010105@linuxfoundation.org>
Date:   Mon, 18 Apr 2022 14:13:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Rameshkumar Sundaram <quic_ramess@...cinc.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 09/63] cfg80211: hold bss_lock while updating nontrans_list

From: Rameshkumar Sundaram <quic_ramess@...cinc.com>

[ Upstream commit a5199b5626cd6913cf8776a835bc63d40e0686ad ]

Synchronize additions to nontrans_list of transmitting BSS with
bss_lock to avoid races. Also when cfg80211_add_nontrans_list() fails
__cfg80211_unlink_bss() needs bss_lock to be held (has lockdep assert
on bss_lock). So protect the whole block with bss_lock to avoid
races and warnings. Found during code review.

Fixes: 0b8fb8235be8 ("cfg80211: Parsing of Multiple BSSID information in scanning")
Signed-off-by: Rameshkumar Sundaram <quic_ramess@...cinc.com>
Link: https://lore.kernel.org/r/1649668071-9370-1-git-send-email-quic_ramess@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/wireless/scan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 6cefaad3b7f8..6bb9437af28b 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1457,11 +1457,13 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 		/* this is a nontransmitting bss, we need to add it to
 		 * transmitting bss' list if it is not there
 		 */
+		spin_lock_bh(&rdev->bss_lock);
 		if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
 					       &res->pub)) {
 			if (__cfg80211_unlink_bss(rdev, res))
 				rdev->bss_generation++;
 		}
+		spin_unlock_bh(&rdev->bss_lock);
 	}
 
 	trace_cfg80211_return_bss(&res->pub);
-- 
2.35.1