Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1320280 > unrolled thread

Re: [PATCH 1/4] mailbox: mailbox-test: Use more consistent format for calling copy_from_user()

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH 1/4] mailbox: mailbox-test: Use more consistent format for  calling copy_from_user() Jassi Brar <jassisinghbrar@gmail.com> - 2016-01-28 05:30 +0100

#1320280 — Re: [PATCH 1/4] mailbox: mailbox-test: Use more consistent format for calling copy_from_user()

On Thu, Jan 14, 2016 at 12:41 PM, Lee Jones <lee.jones@linaro.org> wrote:
> While we're at it, ensure copy-to location is NULL'ed in the error path.
>
> Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
> ---
>  drivers/mailbox/mailbox-test.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
> index 684ae17..7d9b915 100644
> --- a/drivers/mailbox/mailbox-test.c
> +++ b/drivers/mailbox/mailbox-test.c
> @@ -63,9 +63,9 @@ static ssize_t mbox_test_signal_write(struct file *filp,
>         if (!tdev->signal)
>                 return -ENOMEM;
>
> -       ret = copy_from_user(tdev->signal, userbuf, count);
> -       if (ret) {
> +       if (copy_from_user(tdev->signal, userbuf, count)) {
>                 kfree(tdev->signal);
> +               tdev->signal = NULL;
>                 return -EFAULT;
>         }
>
The function is left to return based on an uninitialized variable
('ret' on stack), so please merge this and the patch 2/4.

Thanks.

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web