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Subject[PATCH 5.5 151/151] net/smc: check for valid ib_client_data
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From: Karsten Graul <kgraul@linux.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@syzkaller.appspotmail.com
Fixes: a4cf0443c414 ("smc: introduce SMC as an IB-client")
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -573,6 +573,8 @@ 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 */

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