6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wen Gu <guwen@xxxxxxxxxxxxxxxxx> [ 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@xxxxxxxxxxxxxxxxx Fixes: e5c4744cfb59 ("net/smc: add SMC-Rv2 connection establishment") Signed-off-by: Wen Gu <guwen@xxxxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240507125331.2808-1-guwen@xxxxxxxxxxxxxxxxx Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 89981dbe46c94..598ac9ead64b7 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; } -- 2.43.0
