Merge branch 'net-sched-act_ctinfo-fixes'

Kevin Darbyshire-Bryant says:

====================
net: sched: act_ctinfo: fixes

This is first attempt at sending a small series.  Order is important
because one bug (policy validation) prevents us from encountering the
more important 'OOPS' generating bug in action creation.  Fix the OOPS
first.

Confession time: Until very recently, development of this module has
been done on 'net-next' tree to 'clean compile' level with run-time
testing on backports to 4.14 & 4.19 kernels under openwrt.  It turns out
that sched: action: based code has been under more active change than I
realised.

During the back & forward porting during development & testing, the
critical ACT_P_CREATED return code got missed despite being in the 4.14
& 4.19 backports.  I have now gone through the init functions, using
act_csum as reference with a fine toothed comb and am happy they do the
same things.

This issue hadn't been caught till now due to another issue caused by
new strict nla_parse_nested function failing parsing validation before
action creation.

Thanks to Marcelo Leitner <marcelo.leitner@gmail.com> for flagging
extack deficiency (fixed in 733f0766c3de sched: act_ctinfo: use extack
error reporting) which led to b424e432e770 ("netlink: add validation of
NLA_F_NESTED flag") and 8cb081746c03 ("netlink: make validation more
configurable for future strictness”) which led to the policy validation
fix, which then led to the action creation fix both contained in this
series.

If I ever get to a developer conference please feel free to
tar/feather/apply cone of shame.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/sched/act_ctinfo.c b/net/sched/act_ctinfo.c
index a7d3679d7e2e..10eb2bb99861 100644
--- a/net/sched/act_ctinfo.c
+++ b/net/sched/act_ctinfo.c
@@ -141,7 +141,8 @@ out:
 }
 
 static const struct nla_policy ctinfo_policy[TCA_CTINFO_MAX + 1] = {
-	[TCA_CTINFO_ACT]		  = { .len = sizeof(struct
+	[TCA_CTINFO_ACT]		  = { .type = NLA_EXACT_LEN,
+					      .len = sizeof(struct
 							    tc_ctinfo) },
 	[TCA_CTINFO_ZONE]		  = { .type = NLA_U16 },
 	[TCA_CTINFO_PARMS_DSCP_MASK]	  = { .type = NLA_U32 },
@@ -213,6 +214,7 @@ static int tcf_ctinfo_init(struct net *net, struct nlattr *nla,
 			tcf_idr_cleanup(tn, actparm->index);
 			return ret;
 		}
+		ret = ACT_P_CREATED;
 	} else if (err > 0) {
 		if (bind) /* don't override defaults */
 			return 0;