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 <l...@darbyshire-bryant.me.uk>
---
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;
--
2.20.1 (Apple Git-117)
