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

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Date:   Sun, 11 Nov 2018 19:49:05 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Saeed Mahameed" <saeedm@...lanox.com>,
        "Alex Vesker" <valex@...lanox.com>
Subject: [PATCH 3.16 204/366] net/mlx5: Fix incorrect raw command length
 parsing

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Alex Vesker <valex@...lanox.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@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
Signed-off-by: Ben Hutchings <ben@...adent.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;