linux-stable/fs/notify
Amir Goldstein 4396a73115 fsnotify: fix sb_connectors leak
Fix a leak in s_fsnotify_connectors counter in case of a race between
concurrent add of new fsnotify mark to an object.

The task that lost the race fails to drop the counter before freeing
the unused connector.

Following umount() hangs in fsnotify_sb_delete()/wait_var_event(),
because s_fsnotify_connectors never drops to zero.

Fixes: ec44610fe2 ("fsnotify: count all objects with attached connectors")
Reported-by: Murphy Zhou <jencce.kernel@gmail.com>
Link: https://lore.kernel.org/linux-fsdevel/20210907063338.ycaw6wvhzrfsfdlp@xzhoux.usersys.redhat.com/
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-09-10 09:46:48 -07:00
..
dnotify \n 2020-12-17 10:56:27 -08:00
fanotify \n 2021-08-30 10:04:31 -07:00
inotify ucounts: add missing data type changes 2021-08-09 15:45:02 -05:00
fdinfo.c fanotify: fix permission model of unprivileged group 2021-05-25 12:21:14 +02:00
fdinfo.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fsnotify.c fsnotify: count all objects with attached connectors 2021-08-11 13:50:48 +02:00
fsnotify.h fsnotify: count all objects with attached connectors 2021-08-11 13:50:48 +02:00
group.c fanotify: configurable limits via sysfs 2021-03-16 16:49:31 +01:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mark.c fsnotify: fix sb_connectors leak 2021-09-10 09:46:48 -07:00
notification.c fsnotify: use hash table for faster events merge 2021-03-16 16:37:51 +01:00