net/mlx5: Fix flow counter bulk command out mailbox allocation

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 <roid@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_cmd.c
index 9134010e2921cb1ace000d05832c636667d2a5ba..287ade151ec849861a5d9c18eb27f8c7c7014f7a 100644 (file)
--- 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;