From e4149be608f464bd232f4531a770000f3c7e1f6e Mon Sep 17 00:00:00 2001 From: David Ahern Date: Wed, 1 Apr 2020 21:02:25 -0700 Subject: tools/accounting/getdelays.c: fix netlink attribute length commit 4054ab64e29bb05b3dfe758fff3c38a74ba753bb upstream. A recent change to the netlink code: 6e237d099fac ("netlink: Relax attr validation for fixed length types") logs a warning when programs send messages with invalid attributes (e.g., wrong length for a u32). Yafang reported this error message for tools/accounting/getdelays.c. send_cmd() is wrongly adding 1 to the attribute length. As noted in include/uapi/linux/netlink.h nla_len should be NLA_HDRLEN + payload length, so drop the +1. Fixes: 9e06d3f9f6b1 ("per task delay accounting taskstats interface: documentation fix") Reported-by: Yafang Shao Signed-off-by: David Ahern Signed-off-by: Andrew Morton Tested-by: Yafang Shao Cc: Johannes Berg Cc: Shailabh Nagar Cc: Link: http://lkml.kernel.org/r/20200327173111.63922-1-dsahern@kernel.org Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- Documentation/accounting/getdelays.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Documentation') diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c index f40578026a04..8b14a6b08862 100644 --- a/Documentation/accounting/getdelays.c +++ b/Documentation/accounting/getdelays.c @@ -135,7 +135,7 @@ static int send_cmd(int sd, __u16 nlmsg_type, __u32 nlmsg_pid, msg.g.version = 0x1; na = (struct nlattr *) GENLMSG_DATA(&msg); na->nla_type = nla_type; - na->nla_len = nla_len + 1 + NLA_HDRLEN; + na->nla_len = nla_len + NLA_HDRLEN; memcpy(NLA_DATA(na), nla_data, nla_len); msg.n.nlmsg_len += NLMSG_ALIGN(na->nla_len); -- cgit v1.2.3