linux-kernel - [PATCH 4.19 86/89] net/smc: check for valid ib_client

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Date:   Tue, 17 Mar 2020 11:55:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+84484ccebdd4e5451d91@...kaller.appspotmail.com,
        Karsten Graul <kgraul@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 86/89] net/smc: check for valid ib_client_data

From: Karsten Graul <kgraul@...ux.ibm.com>

commit a2f2ef4a54c0d97aa6a8386f4ff23f36ebb488cf upstream.

In smc_ib_remove_dev() check if the provided ib device was actually
initialized for SMC before.

Reported-by: syzbot+84484ccebdd4e5451d91@...kaller.appspotmail.com
Fixes: a4cf0443c414 ("smc: introduce SMC as an IB-client")
Signed-off-by: Karsten Graul <kgraul@...ux.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/smc/smc_ib.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -552,6 +552,8 @@ static void smc_ib_remove_dev(struct ib_
 	struct smc_ib_device *smcibdev;
 
 	smcibdev = ib_get_client_data(ibdev, &smc_ib_client);
+	if (!smcibdev || smcibdev->ibdev != ibdev)
+		return;
 	ib_set_client_data(ibdev, &smc_ib_client, NULL);
 	spin_lock(&smc_ib_devices.lock);
 	list_del_init(&smcibdev->list); /* remove from smc_ib_devices */