audit: use nlmsg_len() to get message payload length
authorMathias Krause <minipli@googlemail.com>
Mon, 30 Sep 2013 20:04:25 +0000 (22:04 +0200)
committerEric Paris <eparis@redhat.com>
Tue, 5 Nov 2013 16:08:37 +0000 (11:08 -0500)
commit4d8fe7376a12bf4524783dd95cbc00f1fece6232
treedb0c3dae0fa8592ed93e225a852c327d977cd4b9
parente13f91e3c57986a609c10ddf94af0546a2a97dce
audit: use nlmsg_len() to get message payload length

Using the nlmsg_len member of the netlink header to test if the message
is valid is wrong as it includes the size of the netlink header itself.
Thereby allowing to send short netlink messages that pass those checks.

Use nlmsg_len() instead to test for the right message length. The result
of nlmsg_len() is guaranteed to be non-negative as the netlink message
already passed the checks of nlmsg_ok().

Also switch to min_t() to please checkpatch.pl.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@redhat.com>
Cc: stable@vger.kernel.org # v2.6.6+ for the 1st hunk, v2.6.23+ for the 2nd
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
kernel/audit.c