[PATCH 4.16 33/55] net: sched: fix error path in tcf_proto_create() when modules are not configured

From: Greg Kroah-Hartman
Date: Fri May 18 2018 - 04:33:28 EST


4.16-stable review patch. If anyone has any objections, please let me know.

------------------

From: Jiri Pirko <jiri@xxxxxxxxxxxx>

[ Upstream commit d68d75fdc34b0253c2bded7ed18cd60eb5a9599b ]

In case modules are not configured, error out when tp->ops is null
and prevent later null pointer dereference.

Fixes: 33a48927c193 ("sched: push TC filter protocol creation into a separate function")
Signed-off-by: Jiri Pirko <jiri@xxxxxxxxxxxx>
Acked-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sched/cls_api.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -152,8 +152,8 @@ static struct tcf_proto *tcf_proto_creat
NL_SET_ERR_MSG(extack, "TC classifier not found");
err = -ENOENT;
}
- goto errout;
#endif
+ goto errout;
}
tp->classify = tp->ops->classify;
tp->protocol = protocol;