This is a note to let you know that I've just added the patch titled
RDMA/cxgb4: add null-ptr-check after ip_dev_find()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rdma-cxgb4-add-null-ptr-check-after-ip_dev_find.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ce0fd898becaca98892a837c76a3f687138cca7f
Author: Nikita Zhandarovich <n.zhandarovich@xxxxxxxxxx>
Date: Wed Feb 1 09:21:03 2023 -0800
RDMA/cxgb4: add null-ptr-check after ip_dev_find()
[ Upstream commit ef42520240aacfc0d46c8d780c051d135a8dc9b7 ]
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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230201172103.17261-1-n.zhandarovich@xxxxxxxxxx
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 291471d12197f..56f46a16e6575 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -4150,6 +4150,10 @@ 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);
