From 9a5729f68d3a82786aea110b1bfe610be318f80a Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@suse.com>
Date: Thu, 9 May 2019 14:41:50 +0200
Subject: [PATCH] USB: sisusbvga: fix oops in error path of sisusb_probe
Git-commit: 9a5729f68d3a82786aea110b1bfe610be318f80a
Patch-mainline: v5.2-rc3
References: bsc#1146524 CVE-2019-15219

The pointer used to log a failure of usb_register_dev() must
be set before the error is logged.

V2: fix that minor is not available before registration

Signed-off-by: oliver Neukum <oneukum@suse.com>
Reported-by: syzbot+a0cbdbd6d169020c8959@syzkaller.appspotmail.com
Fixes: 7b5cd5fefbe02 ("USB: SisUSB2VGA: Convert printk to dev_* macros")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/usb/misc/sisusbvga/sisusb.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/misc/sisusbvga/sisusb.c b/drivers/usb/misc/sisusbvga/sisusb.c
index 9560fde621ee..ea06f1fed6fa 100644
--- a/drivers/usb/misc/sisusbvga/sisusb.c
+++ b/drivers/usb/misc/sisusbvga/sisusb.c
@@ -3029,6 +3029,13 @@ static int sisusb_probe(struct usb_interface *intf,
 
 	mutex_init(&(sisusb->lock));
 
+	sisusb->sisusb_dev = dev;
+	sisusb->vrambase   = SISUSB_PCI_MEMBASE;
+	sisusb->mmiobase   = SISUSB_PCI_MMIOBASE;
+	sisusb->mmiosize   = SISUSB_PCI_MMIOSIZE;
+	sisusb->ioportbase = SISUSB_PCI_IOPORTBASE;
+	/* Everything else is zero */
+
 	/* Register device */
 	retval = usb_register_dev(intf, &usb_sisusb_class);
 	if (retval) {
@@ -3039,13 +3046,7 @@ static int sisusb_probe(struct usb_interface *intf,
 		goto error_1;
 	}
 
-	sisusb->sisusb_dev = dev;
-	sisusb->minor      = intf->minor;
-	sisusb->vrambase   = SISUSB_PCI_MEMBASE;
-	sisusb->mmiobase   = SISUSB_PCI_MMIOBASE;
-	sisusb->mmiosize   = SISUSB_PCI_MMIOSIZE;
-	sisusb->ioportbase = SISUSB_PCI_IOPORTBASE;
-	/* Everything else is zero */
+	sisusb->minor = intf->minor;
 
 	/* Allocate buffers */
 	sisusb->ibufsize = SISUSB_IBUF_SIZE;
-- 
2.16.4