From: Varun Prakash <varun@chelsio.com>
Date: Wed, 22 May 2019 14:40:55 +0000 (+0530)
Subject: scsi: libcxgbi: add a check for NULL pointer in cxgbi_check_route()
X-Git-Tag: v4.4.183~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a272035ea1bffc4760820859e6ce10688a5ea2c9;p=thirdparty%2Fkernel%2Fstable.git

scsi: libcxgbi: add a check for NULL pointer in cxgbi_check_route()

[ Upstream commit cc555759117e8349088e0c5d19f2f2a500bafdbd ]

ip_dev_find() can return NULL so add a check for NULL pointer.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index f3bb7af4e984e..5eaf14c155900 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -634,6 +634,10 @@ static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 
 	if (ndev->flags & IFF_LOOPBACK) {
 		ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
+		if (!ndev) {
+			err = -ENETUNREACH;
+			goto rel_neigh;
+		}
 		mtu = ndev->mtu;
 		pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 			n->dev->name, ndev->name, mtu);