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RDMA/cxgb4: add null-ptr-check after ip_dev_find()

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[ Upstream commit ef42520240 ]

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: 1cab775c3e ("RDMA/cxgb4: Fix LE hash collision bug for passive open connection")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Link: https://lore.kernel.org/r/20230201172103.17261-1-n.zhandarovich@fintech.ru
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nikita Zhandarovich
2023-02-01 09:21:03 -08:00
committed by Greg Kroah-Hartman
parent fe9dd008b1
commit a661cccff0
1 changed files with 4 additions and 0 deletions
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4
drivers/infiniband/hw/cxgb4/cm.c
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@@ -4144,6 +4144,10 @@ 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);