Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 23/41] USB: usblp: fix use-after-free on disconnect | Date | Sun, 27 Oct 2019 22:01:01 +0100 |
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From: Johan Hovold <johan@kernel.org>
commit 7a759197974894213621aa65f0571b51904733d6 upstream.
A recent commit addressing a runtime PM use-count regression, introduced a use-after-free by not making sure we held a reference to the struct usb_interface for the lifetime of the driver data.
Fixes: 9a31535859bf ("USB: usblp: fix runtime PM after driver unbind") Cc: stable <stable@vger.kernel.org> Reported-by: syzbot+cd24df4d075c319ebfc5@syzkaller.appspotmail.com Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20191015175522.18490-1-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/class/usblp.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/usb/class/usblp.c +++ b/drivers/usb/class/usblp.c @@ -458,6 +458,7 @@ static void usblp_cleanup(struct usblp * kfree(usblp->readbuf); kfree(usblp->device_id_string); kfree(usblp->statusbuf); + usb_put_intf(usblp->intf); kfree(usblp); } @@ -1120,7 +1121,7 @@ static int usblp_probe(struct usb_interf init_waitqueue_head(&usblp->wwait); init_usb_anchor(&usblp->urbs); usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; - usblp->intf = intf; + usblp->intf = usb_get_intf(intf); /* Malloc device ID string buffer to the largest expected length, * since we can re-query it on an ioctl and a dynamic string @@ -1209,6 +1210,7 @@ abort: kfree(usblp->readbuf); kfree(usblp->statusbuf); kfree(usblp->device_id_string); + usb_put_intf(usblp->intf); kfree(usblp); abort_ret: return retval;
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