From 0097ff3d5dad1f76c5e1099d849d52509500708c Mon Sep 17 00:00:00 2001 From: Muhammad Falak R Wani Date: Wed, 20 Jul 2016 17:53:18 -0700 Subject: [PATCH] Input: tty/vt/keyboard - use memdup_user() 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 Reviewed-by: Samuel Thibault Signed-off-by: Dmitry Torokhov --- drivers/tty/vt/keyboard.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c index f973bfc..698ea43 100644 --- a/drivers/tty/vt/keyboard.c +++ b/drivers/tty/vt/keyboard.c @@ -1745,16 +1745,10 @@ int vt_do_diacrit(unsigned int cmd, void __user *udp, int perm) return -EINVAL; if (ct) { - buf = kmalloc(ct * sizeof(struct kbdiacruc), - GFP_KERNEL); - if (buf == NULL) - return -ENOMEM; - - if (copy_from_user(buf, a->kbdiacruc, - ct * sizeof(struct kbdiacruc))) { - kfree(buf); - return -EFAULT; - } + buf = memdup_user(a->kbdiacruc, + ct * sizeof(struct kbdiacruc)); + if (IS_ERR(buf)) + return PTR_ERR(buf); } spin_lock_irqsave(&kbd_event_lock, flags); if (ct) -- 2.7.4