From a658c2e49f02eedafd3e1b6e30a8a9b173d7248b Mon Sep 17 00:00:00 2001 From: Kevin Darbyshire-Bryant Date: Mon, 17 Jun 2019 11:03:26 +0100 Subject: [PATCH] net: sched: act_ctinfo: fix action creation Use correct return value on action creation: ACT_P_CREATED. The use of incorrect return value could result in a situation where the system thought a ctinfo module was listening but actually wasn't instantiated correctly leading to an OOPS in tcf_generic_walker(). 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. 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. Bonus, no more OOPSes. I managed to also miss this issue till now due to the new strict nla_parse_nested function failing validation before action creation. As an inexperienced developer I've learned that copy/pasting/backporting/forward porting code correctly is hard. If I ever get to a developer conference I shall don the cone of shame. Signed-off-by: Kevin Darbyshire-Bryant Signed-off-by: David S. Miller --- net/sched/act_ctinfo.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/sched/act_ctinfo.c b/net/sched/act_ctinfo.c index a7d3679d7e2e..2c17f6843107 100644 --- a/net/sched/act_ctinfo.c +++ b/net/sched/act_ctinfo.c @@ -213,6 +213,7 @@ 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;