[PATCH 4.14 36/68] Input: uinput - fix undefined behavior in uinput_validate_absinfo()

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Torokhov <dmitry.torok...@gmail.com>

commit d77651a227f8920dd7ec179b84e400cce844eeb3 upstream.

An integer overflow may arise in uinput_validate_absinfo() if "max - min"
can't be represented by an "int". We should check for overflow before
trying to use the result.

Reported-by: Kyungtae Kim <kt0...@gmail.com>
Reviewed-by: Peter Hutterer <peter.hutte...@who-t.net>
Cc: sta...@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/input/misc/uinput.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -39,6 +39,7 @@
 #include <linux/fs.h>
 #include <linux/miscdevice.h>
 #include <linux/uinput.h>
+#include <linux/overflow.h>
 #include <linux/input/mt.h>
 #include "../input-compat.h"
 
@@ -356,7 +357,7 @@ static int uinput_open(struct inode *ino
 static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
                                   const struct input_absinfo *abs)
 {
-       int min, max;
+       int min, max, range;
 
        min = abs->minimum;
        max = abs->maximum;
@@ -368,7 +369,7 @@ static int uinput_validate_absinfo(struc
                return -EINVAL;
        }
 
-       if (abs->flat > max - min) {
+       if (!check_sub_overflow(max, min, &range) && abs->flat > range) {
                printk(KERN_DEBUG
                       "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
                       UINPUT_NAME, code, abs->flat, min, max);