linux-kernel - [PATCH v4] infiniband: i40iw: fix a potential NULL pointer dereference

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Date:   Mon, 30 Dec 2019 10:24:28 +0800
From:   Xiyu Yang <xiyuyang19@...an.edu.cn>
To:     xiyuyang19@...an.edu.cn
Cc:     yuanxzhang@...an.edu.cn, kjlu@....edu, leon@...nel.org,
        Markus.Elfring@....de, Xin Tan <tanxin.ctf@...il.com>,
        Faisal Latif <faisal.latif@...el.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Shannon Nelson <shannon.nelson@...el.com>,
        Anjali Singhai Jain <anjali.singhai@...el.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4] infiniband: i40iw: fix a potential NULL pointer dereference

A NULL pointer can be returned by in_dev_get(). Thus add
a corresponding check so that a NULL pointer dereference
will be avoided at this place.

Fixes: 8e06af711bf2 ("i40iw: add main, hdr, status")
Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
Reviewed-by: Leon Romanovsky <leonro@...lanox.com>
---
Changes in v2:
- Release rtnl lock when in_dev_get return NULL
Changes in v3:
- Continue the next loop when in_dev_get return NULL
Changes in v4:
- Change commit message

 drivers/infiniband/hw/i40iw/i40iw_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/hw/i40iw/i40iw_main.c b/drivers/infiniband/hw/i40iw/i40iw_main.c
index d44cf33df81a..238614370927 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_main.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_main.c
@@ -1225,6 +1225,8 @@ static void i40iw_add_ipv4_addr(struct i40iw_device *iwdev)
 			const struct in_ifaddr *ifa;
 
 			idev = in_dev_get(dev);
+			if (!idev)
+				continue;
 			in_dev_for_each_ifa_rtnl(ifa, idev) {
 				i40iw_debug(&iwdev->sc_dev, I40IW_DEBUG_CM,
 					    "IP=%pI4, vlan_id=%d, MAC=%pM\n", &ifa->ifa_address,
-- 
2.7.4