UPSTREAM: net/sched: cls_u32: Fix reference counter leak leading to overflow
[ Upstream commit 04c55383fa5689357bcdd2c8036725a55ed632bc ]
In the event of a failure in tcf_change_indev(), u32_set_parms() will
immediately return without decrementing the recently incremented
reference counter. If this happens enough times, the counter will
rollover and the reference freed, leading to a double free which can be
used to do 'bad things'.
In order to prevent this, move the point of possible failure above the
point where the reference counter is incremented. Also save any
meaningful return values to be applied to the return data at the
appropriate point in time.
This issue was caught with KASAN.
Bug: 273251569
Fixes: 705c7091262d ("net: sched: cls_u32: no need to call tcf_exts_change for newly allocated struct")
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 07f9cc229b44cbcee6385802d390091d915f38c3)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I95524bfda9a08a40b3d54515e528419dba18dc55
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index ed8d26e..e5cc2b4 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -716,12 +716,18 @@ static int u32_set_parms(struct net *net, struct tcf_proto *tp,
struct nlattr *est, bool ovr,
struct netlink_ext_ack *extack)
{
- int err;
+ int err, ifindex = -1;
err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, true, extack);
if (err < 0)
return err;
+ if (tb[TCA_U32_INDEV]) {
+ ifindex = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
+ if (ifindex < 0)
+ return -EINVAL;
+ }
+
if (tb[TCA_U32_LINK]) {
u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
struct tc_u_hnode *ht_down = NULL, *ht_old;
@@ -756,13 +762,9 @@ static int u32_set_parms(struct net *net, struct tcf_proto *tp,
tcf_bind_filter(tp, &n->res, base);
}
- if (tb[TCA_U32_INDEV]) {
- int ret;
- ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack);
- if (ret < 0)
- return -EINVAL;
- n->ifindex = ret;
- }
+ if (ifindex >= 0)
+ n->ifindex = ifindex;
+
return 0;
}
