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authorJohan Hovold <johan@kernel.org>2019-10-09 17:38:47 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-10-10 12:43:18 +0200
commit726b55d0e22ca72c69c947af87785c830289ddbc (patch)
tree178298817b0b9aab6f0328deba1e6f6049abb332 /drivers
parenteb21a74adaa11846737f503dd618bd35337e2c37 (diff)
USB: legousbtower: fix use-after-free on release
The driver was accessing its struct usb_device in its release() callback without holding a reference. This would lead to a use-after-free whenever the device was disconnected while the character device was still open. Fixes: fef526cae700 ("USB: legousbtower: remove custom debug macro") Cc: stable <stable@vger.kernel.org> # 3.12 Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20191009153848.8664-5-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/misc/legousbtower.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index 44d6a3381804..9d4c52a7ebe0 100644
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -296,6 +296,7 @@ static inline void tower_delete (struct lego_usb_tower *dev)
kfree (dev->read_buffer);
kfree (dev->interrupt_in_buffer);
kfree (dev->interrupt_out_buffer);
+ usb_put_dev(dev->udev);
kfree (dev);
}
@@ -810,7 +811,7 @@ static int tower_probe (struct usb_interface *interface, const struct usb_device
mutex_init(&dev->lock);
- dev->udev = udev;
+ dev->udev = usb_get_dev(udev);
dev->open_count = 0;
dev->disconnected = 0;