From: Petr Machata petrm@nvidia.com
commit 665030fd0c1ed9f505932e6e73e7a2c788787a0a upstream.
In mlxsw_sp_nexthop6_init(), a next hop is always added to the router linked list, and mlxsw_sp_nexthop_type_init() is invoked afterwards. When that function results in an error, the next hop will not have been removed from the linked list. As the error is propagated upwards and the caller frees the next hop object, the linked list ends up holding an invalid object.
A similar issue comes up with mlxsw_sp_nexthop4_init(), where rollback block does exist, however does not include the linked list removal.
Both IPv6 and IPv4 next hops have a similar issue with next-hop counter rollbacks. As these were introduced in the same patchset as the next hop linked list, include the cleanup in this patch.
Fixes: dbe4598c1e92 ("mlxsw: spectrum_router: Keep nexthops in a linked list") Fixes: a5390278a5eb ("mlxsw: spectrum: Add support for setting counters on nexthops") Signed-off-by: Petr Machata petrm@nvidia.com Reviewed-by: Amit Cohen amcohen@nvidia.com Signed-off-by: Ido Schimmel idosch@nvidia.com Link: https://lore.kernel.org/r/20220629070205.803952-1-idosch@nvidia.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c @@ -4293,6 +4293,8 @@ static int mlxsw_sp_nexthop4_init(struct return 0;
err_nexthop_neigh_init: + list_del(&nh->router_list_node); + mlxsw_sp_nexthop_counter_free(mlxsw_sp, nh); mlxsw_sp_nexthop_remove(mlxsw_sp, nh); return err; } @@ -6578,6 +6580,7 @@ static int mlxsw_sp_nexthop6_init(struct const struct fib6_info *rt) { struct net_device *dev = rt->fib6_nh->fib_nh_dev; + int err;
nh->nhgi = nh_grp->nhgi; nh->nh_weight = rt->fib6_nh->fib_nh_weight; @@ -6593,7 +6596,16 @@ static int mlxsw_sp_nexthop6_init(struct return 0; nh->ifindex = dev->ifindex;
- return mlxsw_sp_nexthop_type_init(mlxsw_sp, nh, dev); + err = mlxsw_sp_nexthop_type_init(mlxsw_sp, nh, dev); + if (err) + goto err_nexthop_type_init; + + return 0; + +err_nexthop_type_init: + list_del(&nh->router_list_node); + mlxsw_sp_nexthop_counter_free(mlxsw_sp, nh); + return err; }
static void mlxsw_sp_nexthop6_fini(struct mlxsw_sp *mlxsw_sp,