From a22af440349cfa38243ef50c915e0a5a4de59702 Mon Sep 17 00:00:00 2001 From: Karsten Graul Date: Wed, 26 Feb 2020 17:52:46 +0100 Subject: [PATCH] net/smc: check for valid ib_client_data 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 Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/smc/smc_ib.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c index e519ef2..ca505ff 100644 --- a/net/smc/smc_ib.c +++ b/net/smc/smc_ib.c @@ -552,6 +552,8 @@ static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 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 */ -- 2.7.4