diff mbox series

[001/155] tools/accounting/getdelays.c: fix netlink attribute length

Message ID 20200402040225.favho3pCV%akpm@linux-foundation.org
State New
Headers show
Series [001/155] tools/accounting/getdelays.c: fix netlink attribute length | expand

Commit Message

Andrew Morton April 2, 2020, 4:02 a.m. UTC 
From: David Ahern <dsahern@kernel.org>
Subject: tools/accounting/getdelays.c: fix netlink attribute length

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.

Link: http://lkml.kernel.org/r/20200327173111.63922-1-dsahern@kernel.org
Fixes: 9e06d3f9f6b1 ("per task delay accounting taskstats interface: documentation fix")
Signed-off-by: David Ahern <dsahern@kernel.org>
Reported-by: Yafang Shao <laoar.shao@gmail.com>
Tested-by: Yafang Shao <laoar.shao@gmail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/accounting/getdelays.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

--- a/tools/accounting/getdelays.c~getdelays-fix-netlink-attribute-length
+++ a/tools/accounting/getdelays.c
@@ -136,7 +136,7 @@  static int send_cmd(int sd, __u16 nlmsg_
 	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);