net/mlx5: E-Switch, Fix out of bound access when setting vport rate

[ Upstream commit 11aa5800ed66ed0415b7509f02881c76417d212a ]

The code that deals with eswitch vport bw guarantee was going beyond the
eswitch vport array limit, fix that.  This was pointed out by the kernel
address sanitizer (KASAN).

The error from KASAN log:
[2018-09-15 15:04:45] BUG: KASAN: slab-out-of-bounds in
mlx5_eswitch_set_vport_rate+0x8c1/0xae0 [mlx5_core]

Fixes: c9497c98901c ("net/mlx5: Add support for setting VF min rate")
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
index de72b66df3e587d88aec9353c344afd66a8d08ee..1af9894abd95f2a3fa9b369f8fb2b2f92288abf0 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
@@ -1922,7 +1922,7 @@ static u32 calculate_vports_min_rate_divider(struct mlx5_eswitch *esw)
        u32 max_guarantee = 0;
        int i;
 
-       for (i = 0; i <= esw->total_vports; i++) {
+       for (i = 0; i < esw->total_vports; i++) {
                evport = &esw->vports[i];
                if (!evport->enabled || evport->info.min_rate < max_guarantee)
                        continue;
@@ -1942,7 +1942,7 @@ static int normalize_vports_min_rate(struct mlx5_eswitch *esw, u32 divider)
        int err;
        int i;
 
-       for (i = 0; i <= esw->total_vports; i++) {
+       for (i = 0; i < esw->total_vports; i++) {
                evport = &esw->vports[i];
                if (!evport->enabled)
                        continue;