[PATCH 3.16 204/366] net/mlx5: Fix incorrect raw command length parsing

Ben Hutchings
2018-11-11T20:06:03Z

From: Alex Vesker <valex@mellanox.com>

commit 603b7bcff824740500ddfa001d7a7168b0b38542 upstream.

The NULL character was not set correctly for the string containing
the command length, this caused failures reading the output of the
command due to a random length. The fix is to initialize the output
length string.

Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -1028,7 +1028,7 @@ static ssize_t outlen_write(struct file
{
struct mlx5_core_dev *dev = filp->private_data;
struct mlx5_cmd_debug *dbg = &dev->cmd.dbg;
- char outlen_str[8];
+ char outlen_str[8] = {0};
int outlen;
void *ptr;
int err;
@@ -1043,8 +1043,6 @@ static ssize_t outlen_write(struct file
if (copy_from_user(outlen_str, buf, count))
return -EFAULT;

- outlen_str[7] = 0;
-
err = sscanf(outlen_str, "%d", &outlen);
if (err < 0)
return err;