From ce5246b972f7514af899a63c0faf831d05ed5ee1 Mon Sep 17 00:00:00 2001 From: David Teigland Date: Mon, 14 Jan 2008 15:48:58 -0600 Subject: [PATCH] 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 --- fs/dlm/user.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/dlm/user.c b/fs/dlm/user.c index 4f741546f4bb..eb6164816948 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); -- 2.30.2