linux-kernel - [PATCH 4.20 068/117] Input: uinput - fix undefined behavior in uinput_validate

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Message-Id: <20190129113210.978723533@linuxfoundation.org>
Date:   Tue, 29 Jan 2019 12:35:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kyungtae Kim <kt0755@...il.com>,
        Peter Hutterer <peter.hutterer@...-t.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 4.20 068/117] Input: uinput - fix undefined behavior in uinput_validate_absinfo()

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

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

From: Dmitry Torokhov <dmitry.torokhov@...il.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 <kt0755@...il.com>
Reviewed-by: Peter Hutterer <peter.hutterer@...-t.net>
Cc: stable@...r.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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/init.h>
 #include <linux/fs.h>
 #include <linux/miscdevice.h>
+#include <linux/overflow.h>
 #include <linux/input/mt.h>
 #include "../input-compat.h"
 
@@ -405,7 +406,7 @@ 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;
@@ -417,7 +418,7 @@ 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);