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netlink: Add extack message to nlmsg_parse for invalid header length

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Give a user a reason why EINVAL is returned in nlmsg_parse.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Christian Brauner <christian@brauner.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-10-07 20:16:23 -07:00 committed by David S. Miller
parent 4a19edb60d
commit 3d0d4337d7
1 changed files with 3 additions and 1 deletions
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4
include/net/netlink.h
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@ -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);