[SRU][Focal/Jammy/Lunar][PATCH 1/3] net/sched: cls_u32: No longer copy tcf_result on update to avoid use-after-free

[Yuxuan Luo]

From: valis <sec at valis.email>

When u32_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: de5df63228fc ("net: sched: cls_u32 changes to knode must appear atomic to readers")
Reported-by: valis <sec at valis.email>
Reported-by: M A Ramdhan <ramdhan 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/20230729123202.72406-2-jhs@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba at kernel.org>
(cherry picked from commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81)
CVE-2023-4128
Signed-off-by: Yuxuan Luo <yuxuan.luo at canonical.com>
---
 net/sched/cls_u32.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index d15d50de79802..d830ff3da9b8d 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -815,7 +815,6 @@ static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp,
 
 	new->ifindex = n->ifindex;
 	new->fshift = n->fshift;
-	new->res = n->res;
 	new->flags = n->flags;
 	RCU_INIT_POINTER(new->ht_down, ht);
 
-- 
2.34.1