tcp_metrics: validate source addr length

stable inclusion
from stable-v4.19.318
commit 19d997b59fa1fd7a02e770ee0881c0652b9c32c9
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IAGRRM
CVE: CVE-2024-42154

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=19d997b59fa1fd7a02e770ee0881c0652b9c32c9



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[ Upstream commit 66be40e622e177316ae81717aa30057ba9e61dff ]

I don't see anything checking that TCP_METRICS_ATTR_SADDR_IPV4
is at least 4 bytes long, and the policy doesn't have an entry
for this attribute at all (neither does it for IPv6 but v6 is
manually validated).

Reviewed-by: Eric Dumazet <edumazet@google.com>
Fixes: 3e7013dd ("tcp: metrics: Allow selective get/del of tcp-metrics based on src IP")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>