From fd346c9dae6b266f8c3f62df20237059a3a90312 Mon Sep 17 00:00:00 2001 From: Muhammad Falak R Wani Date: Fri, 20 May 2016 18:51:20 +0530 Subject: [PATCH] s390/keyboard: use memdup_user_nul() Use memdup_user_nul to duplicate a memory region from user-space to kernel-space and terminate with a NULL, instead of open coding using kmalloc + copy_from_user and explicitly NULL terminating. Signed-off-by: Muhammad Falak R Wani [heiko.carstens@de.ibm.com: remove comment] Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- drivers/s390/char/keyboard.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-) diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c index ef04a9f7a704..7b9c50aa4cc9 100644 --- a/drivers/s390/char/keyboard.c +++ b/drivers/s390/char/keyboard.c @@ -438,18 +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; - } - /* - * Make sure the string is terminated by 0. User could have - * modified it between us running strnlen_user() and copying it. - */ - p[len - 1] = 0; + p = memdup_user_nul(u_kbs->kb_string, len); + if (IS_ERR(p)) + return PTR_ERR(p); kfree(kbd->func_table[kb_func]); kbd->func_table[kb_func] = p; break; -- 2.39.2