net/smc: fix neighbour and rtable leak in smc_ib_find_route()
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>
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@ -209,13 +209,18 @@ int smc_ib_find_route(struct net *net, __be32 saddr, __be32 daddr,
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if (IS_ERR(rt))
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goto out;
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if (rt->rt_uses_gateway && rt->rt_gw_family != AF_INET)
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goto out;
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neigh = rt->dst.ops->neigh_lookup(&rt->dst, NULL, &fl4.daddr);
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if (neigh) {
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memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
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*uses_gateway = rt->rt_uses_gateway;
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return 0;
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}
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goto out_rt;
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neigh = dst_neigh_lookup(&rt->dst, &fl4.daddr);
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if (!neigh)
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goto out_rt;
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memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
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*uses_gateway = rt->rt_uses_gateway;
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neigh_release(neigh);
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ip_rt_put(rt);
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return 0;
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out_rt:
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ip_rt_put(rt);
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out:
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return -ENOENT;
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}
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