Use memdup_user to duplicate a memory region from user-space to
kernel-space, instead of open coding using kmalloc & copy_from_user.
Signed-off-by: Muhammad Falak R Wani <falakreyaz@xxxxxxxxx>
---
drivers/s390/char/keyboard.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c
index ef04a9f..2955983 100644
--- a/drivers/s390/char/keyboard.c
+++ b/drivers/s390/char/keyboard.c
@@ -438,13 +438,9 @@ do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
return -EFAULT;
if (len > sizeof(u_kbs->kb_string))
return -EINVAL;
- p = kmalloc(len, GFP_KERNEL);
- if (!p)
- return -ENOMEM;
- if (copy_from_user(p, u_kbs->kb_string, len)) {
- kfree(p);
- return -EFAULT;
- }
+ p = memdup_user(u_kbs->kb_string, len);
+ if (IS_ERR(p))
+ return PTR_ERR(p);
/*
* Make sure the string is terminated by 0. User could have
* modified it between us running strnlen_user() and copying it.
--
1.9.1
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