Shardul Bankar 60a25ef8da wireguard: device: use exit_rtnl callback instead of manual rtnl_lock in pre_exit ... wg_netns_pre_exit() manually acquires rtnl_lock() inside the pernet .pre_exit callback. This causes a hung task when another thread holds rtnl_mutex - the cleanup_net workqueue (or the setup_net failure rollback path) blocks indefinitely in wg_netns_pre_exit() waiting to acquire the lock. Convert to .exit_rtnl, introduced in commit 7a60d91c69 ("net: Add ->exit_rtnl() hook to struct pernet_operations."), where the framework already holds RTNL and batches all callbacks under a single rtnl_lock()/rtnl_unlock() pair, eliminating the contention window. The rcu_assign_pointer(wg->creating_net, NULL) is safe to move from .pre_exit to .exit_rtnl (which runs after synchronize_rcu()) because all RCU readers of creating_net either use maybe_get_net() - which returns NULL for a dying namespace with zero refcount - or access net->user_ns which remains valid throughout the entire ops_undo_list sequence. Reported-by: syzbot+f2fbf7478a35a94c8b7c@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?id=cb64c22a492202ca929e18262fdb8cb89e635c70 Signed-off-by: Shardul Bankar <shardul.b@mpiricsoftware.com> [ Jason: added __net_exit and __read_mostly annotations that were missing. ] Fixes: 900575aa33 ("wireguard: device: avoid circular netns references") Cc: stable@vger.kernel.org Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Link: https://patch.msgid.link/20260414153944.2742252-5-Jason@zx2c4.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2026-04-14 11:48:04 -07:00
..
generated	wireguard: netlink: generate netlink code	2025-12-02 04:12:49 +01:00
selftest	wireguard: allowedips: remove redundant space	2026-04-14 11:48:04 -07:00
Makefile	wireguard: netlink: generate netlink code	2025-12-02 04:12:49 +01:00
allowedips.c	wireguard: allowedips: Use kfree_rcu() instead of call_rcu()	2026-04-14 11:48:04 -07:00
allowedips.h	…
cookie.c	…
cookie.h	…
device.c	wireguard: device: use exit_rtnl callback instead of manual rtnl_lock in pre_exit	2026-04-14 11:48:04 -07:00
device.h	…
main.c	…
messages.h	…
netlink.c	wireguard: netlink: generate netlink code	2025-12-02 04:12:49 +01:00
netlink.h	…
noise.c	Convert 'alloc_obj' family to use the new default GFP_KERNEL argument	2026-02-21 17:09:51 -08:00
noise.h	…
peer.c	…
peer.h	…
peerlookup.c	Convert 'alloc_obj' family to use the new default GFP_KERNEL argument	2026-02-21 17:09:51 -08:00
peerlookup.h	…
queueing.c	…
queueing.h	…
ratelimiter.c	Convert 'alloc_obj' family to use the new default GFP_KERNEL argument	2026-02-21 17:09:51 -08:00
ratelimiter.h	…
receive.c	…
send.c	…
socket.c	drivers: net: drop ipv6_stub usage and use direct function calls	2026-03-29 11:21:23 -07:00
socket.h	…
timers.c	…
timers.h	…
version.h	…