rcutorture: Better bounds checking for n_barrier_cbs

A negative value for rcutorture.n_barrier_cbs can pass a negative value
to the memory allocator, so this commit instead causes rcu_barrier()
testing to be disabled in this case.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 59e32684c23b58714ecb26215856f67866cfc58e..7e29a3266139e2a5bd351387895076f6d2680ed5 100644 (file)
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -1507,7 +1507,7 @@ static int rcu_torture_barrier_init(void)
        int i;
        int ret;
 
-       if (n_barrier_cbs == 0)
+       if (n_barrier_cbs <= 0)
                return 0;
        if (cur_ops->call == NULL || cur_ops->cb_barrier == NULL) {
                pr_alert("%s" TORTURE_FLAG