On Sun, Sep 18, 2016 at 06:20:27PM +0300, Or Gerlitz wrote:
> From: Roi Dayan <r...@mellanox.com>
>
> The FW command output length should be only the length of struct
> mlx5_cmd_fc_bulk out field. Failing to do so will cause the memcpy
> call which is invoked later in the driver to write over wrong memory
> address and corrupt kernel memory which results in random crashes.
>
> This bug was found using the kernel address sanitizer (kasan).
>
> Fixes: a351a1b03bf1 ('net/mlx5: Introduce bulk reading of flow counters')
> Signed-off-by: Roi Dayan <r...@mellanox.com>
> Signed-off-by: Or Gerlitz <ogerl...@mellanox.com>
> ---
> drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c
> b/drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c
> index 9134010..287ade1 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c
> @@ -425,11 +425,11 @@ struct mlx5_cmd_fc_bulk *
> mlx5_cmd_fc_bulk_alloc(struct mlx5_core_dev *dev, u16 id, int num)
> {
> struct mlx5_cmd_fc_bulk *b;
> - int outlen = sizeof(*b) +
> + int outlen =
> MLX5_ST_SZ_BYTES(query_flow_counter_out) +
> MLX5_ST_SZ_BYTES(traffic_counter) * num;
>
> - b = kzalloc(outlen, GFP_KERNEL);
> + b = kzalloc(sizeof(*b) + outlen, GFP_KERNEL);
> if (!b)
> return NULL;
^^^^^^^^^ very controversial decision.
The code flow mlx5_fc_stats_query->mlx5_cmd_fc_bulk_alloc->kzalloc
failure is the same for success scenario too.It is not related to the proposed patch. > > -- > 2.3.7 >
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