From: Kangjie Lu <kjlu@umn.edu>
Date: Thu, 11 Apr 2019 09:17:31 +0000 (+0200)
Subject: net/smc: fix a NULL pointer dereference
X-Git-Tag: v5.1-rc6~21^2~24^2~3
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=e183d4e414b64711baf7a04e214b61969ca08dfa;p=uclinux-h8%2Flinux.git

net/smc: fix a NULL pointer dereference

In case alloc_ordered_workqueue fails, the fix returns NULL
to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index 2fff79db1a59..e89e918b88e0 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -289,6 +289,11 @@ struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
 	INIT_LIST_HEAD(&smcd->vlan);
 	smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
 						 WQ_MEM_RECLAIM, name);
+	if (!smcd->event_wq) {
+		kfree(smcd->conn);
+		kfree(smcd);
+		return NULL;
+	}
 	return smcd;
 }
 EXPORT_SYMBOL_GPL(smcd_alloc_dev);