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USB: open disconnect race in iowarrior

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the driver sets intfdata to NULL without lock. Data structures can be
freed and accessed.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2007-10-25 15:46:30 +02:00 committed by Greg Kroah-Hartman
parent 5919a43bbc
commit 03f36e885f
1 changed files with 8 additions and 1 deletions
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9
drivers/usb/misc/iowarrior.c
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@ -66,6 +66,7 @@ module_param(debug, bool, 0644);
MODULE_PARM_DESC(debug, "debug=1 enables debugging messages");
static struct usb_driver iowarrior_driver;
static DEFINE_MUTEX(iowarrior_open_disc_lock);
/*--------------*/
/* data */
@ -608,11 +609,15 @@ static int iowarrior_open(struct inode *inode, struct file *file)
return -ENODEV;
}
mutex_lock(&iowarrior_open_disc_lock);
dev = usb_get_intfdata(interface);
if (!dev)
if (!dev) {
mutex_unlock(&iowarrior_open_disc_lock);
return -ENODEV;
}
mutex_lock(&dev->mutex);
mutex_unlock(&iowarrior_open_disc_lock);
/* Only one process can open each device, no sharing. */
if (dev->opened) {
@ -866,6 +871,7 @@ static void iowarrior_disconnect(struct usb_interface *interface)
int minor;
dev = usb_get_intfdata(interface);
mutex_lock(&iowarrior_open_disc_lock);
usb_set_intfdata(interface, NULL);
minor = dev->minor;
@ -879,6 +885,7 @@ static void iowarrior_disconnect(struct usb_interface *interface)
dev->present = 0;
mutex_unlock(&dev->mutex);
mutex_unlock(&iowarrior_open_disc_lock);
if (dev->opened) {
/* There is a process that holds a filedescriptor to the device ,