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authorOliver Neukum <oliver@neukum.org>2007-10-25 15:46:30 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-25 12:18:46 -0700
commit03f36e885fc26cb0ea299fb6df5171a51e814548 (patch)
treedbc189fa0af4f172c57b97c98cf68718ac0028fd /drivers/usb
parent5919a43bbc649f4770b8b5db33f43136c7ff3153 (diff)
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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/misc/iowarrior.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index c86c132d8aa..764696ff1e8 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 ,