On Fri, Oct 02, 2015 at 03:40:12PM +0200, Javier Martinez Canillas wrote:
> The memdup_user() helper function can be used to duplicate a memory region
> from user-space to kernel-space. There is no need to open code the same
> logic using kmalloc() and copy_from_user() instead. This was found with
> make coccicheck that reported the following warning:
>
> drivers/input/joydev.c:447:10-17: WARNING opportunity for memdup_user
> drivers/input/joydev.c:483:10-17: WARNING opportunity for memdup_user
>
> Signed-off-by: Javier Martinez Canillas <[email protected]>
Applied, thank you.
> ---
>
> drivers/input/joydev.c | 18 ++++++------------
> 1 file changed, 6 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c
> index 6cb5a3e5f9a1..e3dcd4abae18 100644
> --- a/drivers/input/joydev.c
> +++ b/drivers/input/joydev.c
> @@ -444,12 +444,9 @@ static int joydev_handle_JSIOCSAXMAP(struct joydev
> *joydev,
> len = min(len, sizeof(joydev->abspam));
>
> /* Validate the map. */
> - abspam = kmalloc(len, GFP_KERNEL);
> - if (!abspam)
> - return -ENOMEM;
> -
> - if (copy_from_user(abspam, argp, len)) {
> - retval = -EFAULT;
> + abspam = memdup_user(argp, len);
> + if (IS_ERR(abspam)) {
> + retval = PTR_ERR(abspam);
> goto out;
> }
>
> @@ -480,12 +477,9 @@ static int joydev_handle_JSIOCSBTNMAP(struct joydev
> *joydev,
> len = min(len, sizeof(joydev->keypam));
>
> /* Validate the map. */
> - keypam = kmalloc(len, GFP_KERNEL);
> - if (!keypam)
> - return -ENOMEM;
> -
> - if (copy_from_user(keypam, argp, len)) {
> - retval = -EFAULT;
> + keypam = memdup_user(argp, len);
> + if (IS_ERR(keypam)) {
> + retval = PTR_ERR(keypam);
> goto out;
> }
>
> --
> 2.4.3
>
--
Dmitry
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