net/mlx5: Fix uninitialized variable bug in outlen_write()

[ Upstream commit 3f5769a074c13d8f08455e40586600419e02a880 ]

If sscanf() return 0, outlen is uninitialized and used in kzalloc(),
this is unexpected. We should return -EINVAL if the string is invalid.

Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index 85190f2..41c15a6 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -1434,8 +1434,8 @@ static ssize_t outlen_write(struct file *filp, const char __user *buf,
                return -EFAULT;
 
        err = sscanf(outlen_str, "%d", &outlen);
-       if (err < 0)
-               return err;
+       if (err != 1)
+               return -EINVAL;
 
        ptr = kzalloc(outlen, GFP_KERNEL);
        if (!ptr)