linux-kernel - drivers/s390/char/keyboard.c NULL pointer reference

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Date:   Thu, 3 Aug 2017 21:57:38 +0800 (CST)
From:   sohu0106 <sohu0106@....com>
To:     schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Cc:     linux-s390@...r.kernel.org, torvalds@...ux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: drivers/s390/char/keyboard.c NULL pointer reference



Local users able to send the NULL arg argument to kbd_ioctl(), which could cause kernel crash




diff --git a/keyboard.c 
b/keyboard.c
index ba0e4f9..3ec16b1 100644
--- a/keyboard.c
+++ b/keyboard.c
@@ -456,6 +456,8 @@ int kbd_ioctl(struct kbd_data *kbd, unsigned int cmd, unsigned long arg)
        int perm;
 
        argp = (void __user *)arg;
+       if( !argp )
+               return -EFAULT;
 
        /*
         * To have permissions to do most of the vt ioctls, we either have


https://bugzilla.kernel.org/show_bug.cgi?id=196575