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    Subject[PATCH 4.18 038/135] net/mlx5: E-Switch, Fix out of bound access when setting vport rate
    Date
    4.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Eran Ben Elisha <eranbe@mellanox.com>

    [ 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>
    ---
    drivers/net/ethernet/mellanox/mlx5/core/eswitch.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
    +++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
    @@ -2000,7 +2000,7 @@ static u32 calculate_vports_min_rate_div
    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;
    @@ -2020,7 +2020,7 @@ static int normalize_vports_min_rate(str
    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;

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