tree b93814b13155cce67432e1ed11bee58c9a5d5a50
parent b524fe646c9a226a847e30ca1221dc22e952f16b
author Satyam Sharma <ssatyam@cse.iitk.ac.in> 1178612338 +0100
committer Steven Whitehouse <swhiteho@redhat.com> 1183965730 +0100

[DLM] fix a couple of races

Fix two races in fs/dlm/config.c:

(1) Grab the configfs subsystem semaphore before calling
config_group_find_obj() in get_space(). This solves a potential race
between get_space() and concurrent mkdir(2) or rmdir(2).

(2) Grab a reference on the found config_item _while_ holding the configfs
subsystem semaphore in get_comm(), and not after it. This solves a
potential race between get_comm() and concurrent rmdir(2).

Signed-off-by: Satyam Sharma <ssatyam@cse.iitk.ac.in>
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>