[SRU][Focal/Jammy/Lunar][PATCH 3/3] net/sched: cls_route: No longer copy tcf_result on update to avoid use-after-free

[Yuxuan Luo]

From: valis <sec at valis.email>

When route4_change() is called on an existing filter, the whole
tcf_result struct is always copied into the new instance of the filter.

This causes a problem when updating a filter bound to a class,
as tcf_unbind_filter() is always called on the old instance in the
success path, decreasing filter_cnt of the still referenced class
and allowing it to be deleted, leading to a use-after-free.

Fix this by no longer copying the tcf_result struct from the old filter.

Fixes: 1109c00547fc ("net: sched: RCU cls_route")
Reported-by: valis <sec at valis.email>
Reported-by: Bing-Jhong Billy Jheng <billy at starlabs.sg>
Signed-off-by: valis <sec at valis.email>
Signed-off-by: Jamal Hadi Salim <jhs at mojatatu.com>
Reviewed-by: Victor Nogueira <victor at mojatatu.com>
Reviewed-by: Pedro Tammela <pctammela at mojatatu.com>
Reviewed-by: M A Ramdhan <ramdhan at starlabs.sg>
Link: https://lore.kernel.org/r/20230729123202.72406-4-jhs@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba at kernel.org>
(cherry picked from commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8)
CVE-2023-4128
Signed-off-by: Yuxuan Luo <yuxuan.luo at canonical.com>
---
 net/sched/cls_route.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index d0c53724d3e86..1e20bbd687f1d 100644
--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -513,7 +513,6 @@ static int route4_change(struct net *net, struct sk_buff *in_skb,
 	if (fold) {
 		f->id = fold->id;
 		f->iif = fold->iif;
-		f->res = fold->res;
 		f->handle = fold->handle;
 
 		f->tp = fold->tp;
-- 
2.34.1