This is a note to let you know that I've just added the patch titled
USB: chaoskey: fix use-after-free on release
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 93ddb1f56ae102f14f9e46a9a9c8017faa970003 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@xxxxxxxxxx>
Date: Wed, 9 Oct 2019 17:38:45 +0200
Subject: USB: chaoskey: fix use-after-free on release
The driver was accessing its struct usb_interface 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: 66e3e591891d ("usb: Add driver for Altus Metrum ChaosKey device (v2)")
Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.1
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20191009153848.8664-3-johan@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/misc/chaoskey.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/misc/chaoskey.c b/drivers/usb/misc/chaoskey.c
index cf5828ce927a..34e6cd6f40d3 100644
--- a/drivers/usb/misc/chaoskey.c
+++ b/drivers/usb/misc/chaoskey.c
@@ -98,6 +98,7 @@ static void chaoskey_free(struct chaoskey *dev)
usb_free_urb(dev->urb);
kfree(dev->name);
kfree(dev->buf);
+ usb_put_intf(dev->interface);
kfree(dev);
}
}
@@ -145,6 +146,8 @@ static int chaoskey_probe(struct usb_interface *interface,
if (dev == NULL)
goto out;
+ dev->interface = usb_get_intf(interface);
+
dev->buf = kmalloc(size, GFP_KERNEL);
if (dev->buf == NULL)
@@ -174,8 +177,6 @@ static int chaoskey_probe(struct usb_interface *interface,
goto out;
}
- dev->interface = interface;
-
dev->in_ep = in_ep;
if (le16_to_cpu(udev->descriptor.idVendor) != ALEA_VENDOR_ID)
--
2.23.0
