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1346586a9a
The nla_len field in struct nlattr is a __u16, which can only hold values up to 65535. If a nested attribute grows beyond this limit, nla_nest_end() silently truncates the length, producing a corrupted netlink message with no indication of the problem. Since nla_nest_end() is used everywhere and this issue rarely happens, let's add a new helper to check the length. Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Link: https://patch.msgid.link/20260408-b4-ynl_ethtool-v2-4-7623a5e8f70b@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>