dlm: memory leaks on error path in dlm_user_request()

commit d47b41aceeadc6b58abc9c7c6485bef7cfb75636 upstream.

According to comment in dlm_user_request() ua should be freed
in dlm_free_lkb() after successful attach to lkb.

However ua is attached to lkb not in set_lock_args() but later,
inside request_lock().

Fixes 597d0cae0f99 ("[DLM] dlm: user locks")
Cc: stable@kernel.org # 2.6.19
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 311a1c2..21643d2 100644 (file)
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -5792,20 +5792,20 @@ int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua,
                        goto out;
                }
        }
-
-       /* After ua is attached to lkb it will be freed by dlm_free_lkb().
-          When DLM_IFL_USER is set, the dlm knows that this is a userspace
-          lock and that lkb_astparam is the dlm_user_args structure. */
-
        error = set_lock_args(mode, &ua->lksb, flags, namelen, timeout_cs,
                              fake_astfn, ua, fake_bastfn, &args);
-       lkb->lkb_flags |= DLM_IFL_USER;
-
        if (error) {
+               kfree(ua->lksb.sb_lvbptr);
+               ua->lksb.sb_lvbptr = NULL;
+               kfree(ua);
                __put_lkb(ls, lkb);
                goto out;
        }
 
+       /* After ua is attached to lkb it will be freed by dlm_free_lkb().
+          When DLM_IFL_USER is set, the dlm knows that this is a userspace
+          lock and that lkb_astparam is the dlm_user_args structure. */
+       lkb->lkb_flags |= DLM_IFL_USER;
        error = request_lock(ls, lkb, name, namelen, &args);
 
        switch (error) {