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

[Xiyu Yang]

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@xxxxxxxxxxxx>
Signed-off-by: Xin Tan <tanxin.ctf@xxxxxxxxx>
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
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