Patch "Input: evdev - fix EVIOCG{type} ioctl" has been added to the 3.14-stable tree

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This is a note to let you know that I've just added the patch titled

    Input: evdev - fix EVIOCG{type} ioctl

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     input-evdev-fix-eviocg-type-ioctl.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 7c4f56070fde2367766fa1fb04852599b5e1ad35 Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Date: Mon, 6 Oct 2014 10:55:49 -0700
Subject: Input: evdev - fix EVIOCG{type} ioctl

From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>

commit 7c4f56070fde2367766fa1fb04852599b5e1ad35 upstream.

The 'max' size passed into the function is measured in number of bits
(KEY_MAX, LED_MAX, etc) so we need to convert it accordingly before trying
to copy the data out, otherwise we will try copying too much and end up
with up with a page fault.

Reported-by: Pavel Machek <pavel@xxxxxx>
Reviewed-by: Pavel Machek <pavel@xxxxxx>
Reviewed-by: David Herrmann <dh.herrmann@xxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/input/evdev.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -757,20 +757,23 @@ static int evdev_handle_set_keycode_v2(s
  */
 static int evdev_handle_get_val(struct evdev_client *client,
 				struct input_dev *dev, unsigned int type,
-				unsigned long *bits, unsigned int max,
-				unsigned int size, void __user *p, int compat)
+				unsigned long *bits, unsigned int maxbit,
+				unsigned int maxlen, void __user *p,
+				int compat)
 {
 	int ret;
 	unsigned long *mem;
+	size_t len;
 
-	mem = kmalloc(sizeof(unsigned long) * max, GFP_KERNEL);
+	len = BITS_TO_LONGS(maxbit) * sizeof(unsigned long);
+	mem = kmalloc(len, GFP_KERNEL);
 	if (!mem)
 		return -ENOMEM;
 
 	spin_lock_irq(&dev->event_lock);
 	spin_lock(&client->buffer_lock);
 
-	memcpy(mem, bits, sizeof(unsigned long) * max);
+	memcpy(mem, bits, len);
 
 	spin_unlock(&dev->event_lock);
 
@@ -778,7 +781,7 @@ static int evdev_handle_get_val(struct e
 
 	spin_unlock_irq(&client->buffer_lock);
 
-	ret = bits_to_user(mem, max, size, p, compat);
+	ret = bits_to_user(mem, maxbit, maxlen, p, compat);
 	if (ret < 0)
 		evdev_queue_syn_dropped(client);
 


Patches currently in stable-queue which might be from dmitry.torokhov@xxxxxxxxx are

queue-3.14/input-evdev-fix-eviocg-type-ioctl.patch
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