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Message-Id: <20191016214829.399329062@linuxfoundation.org>
Date: Wed, 16 Oct 2019 14:50:52 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Johan Hovold <johan@...nel.org>
Subject: [PATCH 4.14 38/65] USB: legousbtower: fix use-after-free on release
From: Johan Hovold <johan@...nel.org>
commit 726b55d0e22ca72c69c947af87785c830289ddbc upstream.
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@...r.kernel.org> # 3.12
Signed-off-by: Johan Hovold <johan@...nel.org>
Link: https://lore.kernel.org/r/20191009153848.8664-5-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/usb/misc/legousbtower.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -300,6 +300,7 @@ static inline void tower_delete (struct
kfree (dev->read_buffer);
kfree (dev->interrupt_in_buffer);
kfree (dev->interrupt_out_buffer);
+ usb_put_dev(dev->udev);
kfree (dev);
}
@@ -813,7 +814,7 @@ static int tower_probe (struct usb_inter
mutex_init(&dev->lock);
- dev->udev = udev;
+ dev->udev = usb_get_dev(udev);
dev->open_count = 0;
dev->disconnected = 0;
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