On Sat 13-02-21 15:05:28, Ivan Safonov wrote:
> memdup_user() is shorter and safer equivalent
> of kmalloc/copy_from_user pair.
>
> Signed-off-by: Ivan Safonov <insafo...@gmail.com>
> ---
> drivers/staging/wlan-ng/p80211netdev.c | 28 ++++++++++++--------------
> 1 file changed, 13 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/staging/wlan-ng/p80211netdev.c
> b/drivers/staging/wlan-ng/p80211netdev.c
> index a15abb2c8f54..6f9666dc0277 100644
> --- a/drivers/staging/wlan-ng/p80211netdev.c
> +++ b/drivers/staging/wlan-ng/p80211netdev.c
> @@ -569,24 +569,22 @@ static int p80211knetdev_do_ioctl(struct net_device
> *dev,
> goto bail;
> }
>
> - /* Allocate a buf of size req->len */
> - msgbuf = kmalloc(req->len, GFP_KERNEL);
> - if (msgbuf) {
> - if (copy_from_user(msgbuf, (void __user *)req->data, req->len))
> - result = -EFAULT;
> - else
> - result = p80211req_dorequest(wlandev, msgbuf);
> + msgbuf = memdup_user(req->data, req->len);
Move to memdup_user is definitely a right step. What is the range of
req->len though? If this can be larger than PAGE_SIZE then vmemdup_user
would be a better alternative.
--
Michal Hocko
SUSE Labs
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