Roger Pau Monne 6b53db8c4c xen-netback: take a reference to the RX task thread ... commit 107866a8eb0b664675a260f1ba0655010fac1e08 upstream. Do this in order to prevent the task from being freed if the thread returns (which can be triggered by the frontend) before the call to kthread_stop done as part of the backend tear down. Not taking the reference will lead to a use-after-free in that scenario. Such reference was taken before but dropped as part of the rework done in 2ac061ce97. Reintroduce the reference taking and add a comment this time explaining why it's needed. This is XSA-374 / CVE-2021-28691. Fixes: 2ac061ce97 ('xen/netback: cleanup init and deinit code') Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Cc: stable@vger.kernel.org Reviewed-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-06-10 13:39:29 +02:00
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common.h	xen/netback: use lateeoi irq binding	2020-10-20 10:22:03 +02:00
hash.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
interface.c	xen-netback: take a reference to the RX task thread	2021-06-10 13:39:29 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
netback.c	xen-netback: respect gnttab_map_refs()'s return value	2021-03-07 12:34:15 +01:00
rx.c	xen/netback: avoid race in xenvif_rx_ring_slots_available()	2021-02-17 11:02:26 +01:00
xenbus.c	xen-netback: Check for hotplug-status existence before watching	2021-04-28 13:40:02 +02:00