linux-kernel - [PATCH 2/4] [DLM] fix a couple of races

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Message-Id: <11821784801162-git-send-email-swhiteho@redhat.com>
Date:	Mon, 18 Jun 2007 15:54:28 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	cluster-devel@...hat.com, linux-kernel@...r.kernel.org
Cc:	Satyam Sharma <ssatyam@....iitk.ac.in>,
	David Teigland <teigland@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 2/4] [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@....iitk.ac.in>
Signed-off-by: David Teigland <teigland@...hat.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
---
 fs/dlm/config.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)
View attachment "1f692e48dd1f3fa00629c69b2e34ab35c9929b45.diff" of type "text/x-patch" (1067 bytes)