padata: Check for valid cpumasks

Now that we allow to change the cpumasks from userspace, we have to check for valid cpumasks in padata_do_parallel. This patch adds the necessary check. This fixes a division by zero crash if the parallel cpumask contains no active cpu. Signed-off-by: Steffen Klassert <[email protected]> Signed-off-by: Herbert Xu <[email protected]>
patjak · Jul 26, 2010 · 7424713 · 7424713
1 parent b89661d
commit 7424713
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/kernel/padata.c b/kernel/padata.c
@@ -114,7 +114,7 @@ int padata_do_parallel(struct padata_instance *pinst,
 	pd = rcu_dereference(pinst->pd);
 
 	err = -EINVAL;
-	if (!(pinst->flags & PADATA_INIT))
+	if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID)
 		goto out;
 
 	if (!cpumask_test_cpu(cb_cpu, pd->cpumask.cbcpu))