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net/smc: fix neighbour and rtable leak in smc_ib_find_route()

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[ Upstream commit 2ddc0dd7fec86ee53b8928a5cca5fbddd4fc7c06 ]

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: e5c4744cfb ("net/smc: add SMC-Rv2 connection establishment")
Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240507125331.2808-1-guwen@linux.alibaba.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wen Gu 2024-05-07 20:53:31 +08:00 • committed by Greg Kroah-Hartman
parent e31b25cc20
commit 5df93c029a
1 changed files with 12 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

19
net/smc/smc_ib.c
View file

@ -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;
}