diff options
| author | Oliver Neukum <oliver@neukum.org> | 2007-10-25 17:46:30 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-10-25 23:18:46 +0400 |
| commit | 03f36e885fc26cb0ea299fb6df5171a51e814548 (patch) | |
| tree | dbc189fa0af4f172c57b97c98cf68718ac0028fd | |
| parent | 5919a43bbc649f4770b8b5db33f43136c7ff3153 (diff) | |
| download | linux-03f36e885fc26cb0ea299fb6df5171a51e814548.tar.xz | |
USB: open disconnect race in iowarrior
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>
| -rw-r--r-- | drivers/usb/misc/iowarrior.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c index c86c132d8aae..764696ff1e8e 100644 --- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -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 , |