net/mlx5: Fix incorrect raw command length parsing

[ Upstream commit 603b7bcff824740500ddfa001d7a7168b0b38542 ]

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index 6631fb0782d787d4da2fbb79a74e8bef10c3ee33..05de3bb7f7c057c80c4a4b0a6733eb157d7c8ef5 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -1256,7 +1256,7 @@ static ssize_t outlen_write(struct file *filp, const char __user *buf,
 {
        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;
@@ -1271,8 +1271,6 @@ static ssize_t outlen_write(struct file *filp, const char __user *buf,
        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;