[PATCH] mlxsw: spectrum_router: Fix use after free

[Vincent Stehlé]

In mlxsw_sp_router_fib4_add_info_destroy(), the fib_entry pointer is used
after it has been freed by mlxsw_sp_fib_entry_destroy(). Use a temporary
variable to fix this.

Fixes: 61c503f976b5449e ("mlxsw: spectrum_router: Implement fib4 add/del 
switchdev obj ops")
Signed-off-by: Vincent Stehlé <vincent.ste...@laposte.net>
Cc: Jiri Pirko <j...@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 81418d6..90bb93b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -1651,9 +1651,10 @@ static void mlxsw_sp_router_fib4_add_info_destroy(void 
const *data)
        const struct mlxsw_sp_router_fib4_add_info *info = data;
        struct mlxsw_sp_fib_entry *fib_entry = info->fib_entry;
        struct mlxsw_sp *mlxsw_sp = info->mlxsw_sp;
+       struct mlxsw_sp_vr *vr = fib_entry->vr;
 
        mlxsw_sp_fib_entry_destroy(fib_entry);
-       mlxsw_sp_vr_put(mlxsw_sp, fib_entry->vr);
+       mlxsw_sp_vr_put(mlxsw_sp, vr);
        kfree(info);
 }
 
-- 
2.8.1