linux-kernel - [PATCH] RDMA/cxgb4: add null-ptr-check after ip_dev

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Message-ID: <20230201172103.17261-1-n.zhandarovich@fintech.ru>
Date:   Wed, 1 Feb 2023 09:21:03 -0800
From:   Nikita Zhandarovich <n.zhandarovich@...tech.ru>
To:     Potnuri Bharat Teja <bharat@...lsio.com>
CC:     Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Roland Dreier <roland@...estorage.com>,
        Vipul Pandya <vipul@...lsio.com>, <linux-rdma@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <lvc-project@...uxtesting.org>
Subject: [PATCH] RDMA/cxgb4: add null-ptr-check after ip_dev_find()

ip_dev_find() may return NULL and assign it to pdev which is
dereferenced later.
Fix this by checking the return value of ip_dev_find() for NULL
similar to the way it is done with other instances of said function.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 1cab775c3e75 ("RDMA/cxgb4: Fix LE hash collision bug for passive open connection")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
---
 drivers/infiniband/hw/cxgb4/cm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index c16017f6e8db..07d0bafb7ac5 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -4151,6 +4151,10 @@ static int rx_pkt(struct c4iw_dev *dev, struct sk_buff *skb)
 
 	if (neigh->dev->flags & IFF_LOOPBACK) {
 		pdev = ip_dev_find(&init_net, iph->daddr);
+		if (!pdev) {
+			pr_err("%s - failed to find device!\n", __func__);
+			goto free_dst;
+		}
 		e = cxgb4_l2t_get(dev->rdev.lldi.l2t, neigh,
 				    pdev, 0);
 		pi = (struct port_info *)netdev_priv(pdev);
-- 
2.25.1