From: Wen Gu <guwen@linux.alibaba.com>
To: wenjia@linux.ibm.com, jaka@linux.ibm.com, davem@davemloft.net,
edumazet@google.com, kuba@kernel.org, pabeni@redhat.com
Cc: kgraul@linux.ibm.com, alibuda@linux.alibaba.com,
tonylu@linux.alibaba.com, guwen@linux.alibaba.com,
linux-s390@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH net v2] net/smc: fix neighbour and rtable leak in smc_ib_find_route()
Date: Tue, 7 May 2024 20:53:31 +0800 [thread overview]
Message-ID: <20240507125331.2808-1-guwen@linux.alibaba.com> (raw)
In smc_ib_find_route(), the neighbour found by neigh_lookup() and rtable
resolved by ip_route_output_flow() are not released or put before return.
It may cause the refcount leak, so fix it.
Link: https://lore.kernel.org/r/20240506015439.108739-1-guwen@linux.alibaba.com
Fixes: e5c4744cfb59 ("net/smc: add SMC-Rv2 connection establishment")
Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
---
v2->v1
- call ip_rt_put() to release rt as well.
---
net/smc/smc_ib.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c
index 97704a9e84c7..9297dc20bfe2 100644
--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -209,13 +209,18 @@ int smc_ib_find_route(struct net *net, __be32 saddr, __be32 daddr,
if (IS_ERR(rt))
goto out;
if (rt->rt_uses_gateway && rt->rt_gw_family != AF_INET)
- goto out;
- neigh = rt->dst.ops->neigh_lookup(&rt->dst, NULL, &fl4.daddr);
- if (neigh) {
- memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
- *uses_gateway = rt->rt_uses_gateway;
- return 0;
- }
+ goto out_rt;
+ neigh = dst_neigh_lookup(&rt->dst, &fl4.daddr);
+ if (!neigh)
+ goto out_rt;
+ memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
+ *uses_gateway = rt->rt_uses_gateway;
+ neigh_release(neigh);
+ ip_rt_put(rt);
+ return 0;
+
+out_rt:
+ ip_rt_put(rt);
out:
return -ENOENT;
}
--
2.32.0.3.g01195cf9f
next reply other threads:[~2024-05-07 12:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-07 12:53 Wen Gu [this message]
2024-05-07 13:12 ` [PATCH net v2] net/smc: fix neighbour and rtable leak in smc_ib_find_route() Wenjia Zhang
2024-05-09 8:20 ` patchwork-bot+netdevbpf
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