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[PATCH] USB: ub oops in block_uevent 

In kernel 2.6.16, if a mounted storage device is removed, an oops happens
because ub supplies an interface device (and kobject) to the block layer,
but neglects to pin it. And apparently, the block layer expects its users
to pin device structures.

The code in ub was broken this way for years. But the bug was exposed only
by 2.6.16 when it started to call block_uevent on close, which traverses
device structures (kobjects actually).

Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pete Zaitcev 2006-05-03 00:16:00 -07:00 committed by Greg Kroah-Hartman
parent 436f5762bc
commit 77ef6c4d6e
1 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/block/ub.c
View File

@ -536,6 +536,9 @@ static void ub_cleanup(struct ub_dev *sc)
kfree(lun);
}
usb_set_intfdata(sc->intf, NULL);
usb_put_intf(sc->intf);
usb_put_dev(sc->dev);
kfree(sc);
}
@ -2221,7 +2224,12 @@ static int ub_probe(struct usb_interface *intf,
// sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
usb_set_intfdata(intf, sc);
usb_get_dev(sc->dev);
// usb_get_intf(sc->intf); /* Do we need this? */
/*
* Since we give the interface struct to the block level through
* disk->driverfs_dev, we have to pin it. Otherwise, block_uevent
* oopses on close after a disconnect (kernels 2.6.16 and up).
*/
usb_get_intf(sc->intf);
snprintf(sc->name, 12, DRV_NAME "(%d.%d)",
sc->dev->bus->busnum, sc->dev->devnum);
@ -2286,7 +2294,7 @@ static int ub_probe(struct usb_interface *intf,
err_dev_desc:
usb_set_intfdata(intf, NULL);
// usb_put_intf(sc->intf);
usb_put_intf(sc->intf);
usb_put_dev(sc->dev);
kfree(sc);
err_core:
@ -2461,12 +2469,6 @@ static void ub_disconnect(struct usb_interface *intf)
* and no URBs left in transit.
*/
usb_set_intfdata(intf, NULL);
// usb_put_intf(sc->intf);
sc->intf = NULL;
usb_put_dev(sc->dev);
sc->dev = NULL;
ub_put(sc);
}