linux-kernel - [PATCH v2] infiniband: i40iw: fix a potential NULL pointer dereference

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Message-Id: <1577364757-18385-1-git-send-email-xiyuyang19@fudan.edu.cn>
Date:   Thu, 26 Dec 2019 20:52:37 +0800
From:   xiyuyang19@...an.edu.cn
To:     xiyuyang19@...an.edu.cn
Cc:     yuanxzhang@...an.edu.cn, kjlu@....edu, leon@...nel.org,
        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>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] infiniband: i40iw: fix a potential NULL pointer dereference

From: Xiyu Yang <xiyuyang19@...an.edu.cn>

in_dev_get may return a NULL object. The fix handles the situation
by adding a check to avoid NULL pointer dereference on idev,
as pick_local_ipaddrs does.

Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
---
Changes in v2:
- Release rtnl lock when in_dev_get return NULL

 drivers/infiniband/hw/i40iw/i40iw_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/infiniband/hw/i40iw/i40iw_main.c b/drivers/infiniband/hw/i40iw/i40iw_main.c
index d44cf33d..d7146fdf 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_main.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_main.c
@@ -1225,6 +1225,10 @@ static void i40iw_add_ipv4_addr(struct i40iw_device *iwdev)
 			const struct in_ifaddr *ifa;
 
 			idev = in_dev_get(dev);
+			if (!idev) {
+				i40iw_pr_err("ipv4 inet device not found\n");
+				break;
+			}
 			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