netlink: Add extack message to nlmsg_parse for invalid header length (3d0d4337) · Commits · 戴 / test

Give a user a reason why EINVAL is returned in nlmsg_parse. Signed-off-by:

include/net/netlink.h

+3 −1

Original line number	Diff line number	Diff line
		@@ -516,8 +516,10 @@ static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
		const struct nla_policy *policy,
		struct netlink_ext_ack *extack)
		{
		if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
		if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) {
		NL_SET_ERR_MSG(extack, "Invalid header length");
		return -EINVAL;
		}

		return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen),
		nlmsg_attrlen(nlh, hdrlen), policy, extack);