netfilter: nfnetlink_cthelper: hit EBUSY on updates if size mismatches
stable inclusion from stable-5.10.43 commit 8d614eebc003bb7763993e6fcdc8f853401bc17e bugzilla: 109284 CVE: NA -------------------------------- [ Upstream commit 8971ee8b ] The private helper data size cannot be updated. However, updates that contain NFCTH_PRIV_DATA_LEN might bogusly hit EBUSY even if the size is the same. Fixes: 12f7a505 ("netfilter: add user-space connection tracking helper infrastructure") Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: NSasha Levin <sashal@kernel.org> Signed-off-by: NChen Jun <chenjun102@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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