linux-kernel - [PATCH 16/19] dlm: fix possible use-after-free

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Message-Id: <1201193442-8260-17-git-send-email-teigland@redhat.com>
Date:	Thu, 24 Jan 2008 10:50:39 -0600
From:	David Teigland <teigland@...hat.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH 16/19] dlm: fix possible use-after-free

The dlm_put_lkb() can free the lkb and its associated ua structure,
so we can't depend on using the ua struct after the put.

Signed-off-by: David Teigland <teigland@...hat.com>
---
 fs/dlm/user.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 4f74154..eb61648 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -236,12 +236,12 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, int type)
 	spin_unlock(&proc->asts_spin);
 
 	if (eol) {
-		spin_lock(&ua->proc->locks_spin);
+		spin_lock(&proc->locks_spin);
 		if (!list_empty(&lkb->lkb_ownqueue)) {
 			list_del_init(&lkb->lkb_ownqueue);
 			dlm_put_lkb(lkb);
 		}
-		spin_unlock(&ua->proc->locks_spin);
+		spin_unlock(&proc->locks_spin);
 	}
  out:
 	mutex_unlock(&ls->ls_clear_proc_locks);
-- 
1.5.3.3

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