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@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>
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@ -4150,6 +4150,10 @@ static int rx_pkt(struct c4iw_dev *dev, struct sk_buff *skb)
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if (neigh->dev->flags & IFF_LOOPBACK) {
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pdev = ip_dev_find(&init_net, iph->daddr);
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if (!pdev) {
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pr_err("%s - failed to find device!\n", __func__);
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goto free_dst;
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}
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e = cxgb4_l2t_get(dev->rdev.lldi.l2t, neigh,
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pdev, 0);
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pi = (struct port_info *)netdev_priv(pdev);
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