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Thu, 28 Mar 2024 04:32:50 -0700 (PDT) Received: from localhost.localdomain ([83.217.198.104]) by smtp.gmail.com with ESMTPSA id b14-20020ac25e8e000000b00513e9f88249sm164038lfq.207.2024.03.28.04.32.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Mar 2024 04:32:50 -0700 (PDT) From: Denis Kirjanov X-Google-Original-From: Denis Kirjanov To: netdev@vger.kernel.org Cc: edumazet@google.com, jgg@ziepe.ca, leon@kernel.org, Denis Kirjanov , syzbot+5fe14f2ff4ccbace9a26@syzkaller.appspotmail.com Subject: [PATCH v2 net] RDMA/core: fix UAF in ib_get_eth_speed Date: Thu, 28 Mar 2024 07:32:33 -0400 Message-Id: <20240328113233.21388-1-dkirjanov@suse.de> X-Mailer: git-send-email 2.30.2 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A call to ib_device_get_netdev from ib_get_eth_speed may lead to a race condition while accessing a netdevice instance since we don't hold the rtnl lock while checking the registration state: if (res && res->reg_state != NETREG_REGISTERED) { v2: unlock rtnl on error patch Reported-by: syzbot+5fe14f2ff4ccbace9a26@syzkaller.appspotmail.com Fixes: d41861942fc55 ("IB/core: Add generic function to extract IB speed from netdev") Signed-off-by: Denis Kirjanov --- drivers/infiniband/core/verbs.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c index 94a7f3b0c71c..9c09d8c328b4 100644 --- a/drivers/infiniband/core/verbs.c +++ b/drivers/infiniband/core/verbs.c @@ -1976,11 +1976,13 @@ int ib_get_eth_speed(struct ib_device *dev, u32 port_num, u16 *speed, u8 *width) if (rdma_port_get_link_layer(dev, port_num) != IB_LINK_LAYER_ETHERNET) return -EINVAL; + rtnl_lock(); netdev = ib_device_get_netdev(dev, port_num); - if (!netdev) + if (!netdev) { + rtnl_unlock() return -ENODEV; + } - rtnl_lock(); rc = __ethtool_get_link_ksettings(netdev, &lksettings); rtnl_unlock(); -- 2.30.2