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Tue, 09 Dec 2025 21:32:21 -0800 (PST) Received: from localhost.localdomain ([38.134.139.135]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29daeae6e95sm173061665ad.95.2025.12.09.21.32.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Dec 2025 21:32:20 -0800 (PST) From: Dharanitharan R To: syzbot+422806e5f4cce722a71f@syzkaller.appspotmail.com Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, dharanitharan725@gmail.com Subject: [PATCH net v2] team: fix qom_list corruption by using list_del_init_rcu() Date: Wed, 10 Dec 2025 05:31:05 +0000 Message-ID: <20251210053104.23608-2-dharanitharan725@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In __team_queue_override_port_del(), repeated deletion of the same port using list_del_rcu() could corrupt the RCU-protected qom_list. This happens if the function is called multiple times on the same port, for example during port removal or team reconfiguration. This patch replaces list_del_rcu() with list_del_init_rcu() to: - Ensure safe repeated deletion of the same port - Keep the RCU list consistent - Avoid potential use-after-free and list corruption issues Testing: - Syzbot-reported crash is eliminated in testing. - Kernel builds and runs cleanly Fixes: 108f9405ce81 ("team: add queue override configuration mechanism") Reported-by: syzbot+422806e5f4cce722a71f@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D422806e5f4cce722a71f Signed-off-by: Dharanitharan R --- drivers/net/team/team_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/team/team_core.c b/drivers/net/team/team_core.c index 4d5c9ae8f221..d6d724b52dbf 100644 --- a/drivers/net/team/team_core.c +++ b/drivers/net/team/team_core.c @@ -823,7 +823,8 @@ static void __team_queue_override_port_del(struct team = *team, { if (!port->queue_id) return; - list_del_rcu(&port->qom_list); + /* Ensure safe repeated deletion */ + list_del_init_rcu(&port->qom_list); } =20 static bool team_queue_override_port_has_gt_prio_than(struct team_port *po= rt, --=20 2.43.0