From: Colin Ian King <colin.king@canonical.com>
Date: Sun, 1 Oct 2017 17:27:35 +0100
Subject: mlxsw: spectrum: fix uninitialized value in err
Patch-mainline: v4.15-rc1
Git-commit: 45bfbc013b4294cadafbef821d377d3a99c7ab1e
References: bsc#1112374

In the unlikely event that mfc->mfc_un.res.ttls[i] is 255 for all
values of i from 0 to MAXIVS-1, the err is not set at all and hence
has a garbage value on the error return at the end of the function,
so initialize it to 0.  Also, the error return check on err and goto
to err: inside the for loop makes it impossible for err to be zero
at the end of the for loop, so we can remove the redundant err check
at the end of the loop.

Detected by CoverityScan CID#1457207 ("Unitialized scalar value")

Fixes: c011ec1bbfd6 ("mlxsw: spectrum: Add the multicast routing offloading logic")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Yotam Gigi <yotamg@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c
@@ -349,7 +349,7 @@ mlxsw_sp_mr_route4_create(struct mlxsw_s
 {
 	struct mlxsw_sp_mr_route_vif_entry *rve, *tmp;
 	struct mlxsw_sp_mr_route *mr_route;
-	int err;
+	int err = 0;
 	int i;
 
 	/* Allocate and init a new route and fill it with parameters */
@@ -376,8 +376,6 @@ mlxsw_sp_mr_route4_create(struct mlxsw_s
 		}
 	}
 	mlxsw_sp_mr_route_ivif_link(mr_route, &mr_table->vifs[mfc->mfc_parent]);
-	if (err)
-		goto err;
 
 	mr_route->route_action = mlxsw_sp_mr_route_action(mr_route);
 	return mr_route;