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