diff options
| author | Javier Martinez Canillas <javier@osg.samsung.com> | 2015-10-02 21:12:53 +0300 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-10-02 21:44:16 +0300 |
| commit | 5702222c9a7af4a207066d54aa95cfe31f34f2f8 (patch) | |
| tree | 4e81af9337a13eb55af535cbb028ac6a9b52bf8e | |
| parent | aaa59e0911f5624663217c248cfa7cc1c2e33e08 (diff) | |
| download | linux-5702222c9a7af4a207066d54aa95cfe31f34f2f8.tar.xz | |
Input: joydev - use memdup_user() to duplicate memory from user-space
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 <javier@osg.samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
| -rw-r--r-- | drivers/input/joydev.c | 18 |
1 files 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; } |