netfilter: ctnetlink: fix possible refcount leak in ctnetlink_create_conntrack()

stable inclusion
from stable-v4.19.275
commit 43b9a9c78e37a5532c2a9260dff9d9989f2bbb23
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I8SL4W
CVE: CVE-2023-7192

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=43b9a9c78e37a5532c2a9260dff9d9989f2bbb23



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[ Upstream commit ac489398 ]

nf_ct_put() needs to be called to put the refcount got by
nf_conntrack_find_get() to avoid refcount leak when
nf_conntrack_hash_check_insert() fails.

Fixes: 7d367e06 ("netfilter: ctnetlink: fix soft lockup when netlink adds new entries (v2)")
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Dong Chenchen <dongchenchen2@huawei.com>