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);