From: Steffen Klassert Date: Tue, 20 Jul 2010 06:51:25 +0000 (+0200) Subject: padata: Check for valid cpumasks X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=7424713b83587006da72da84d7922471e366faba;p=deliverable%2Flinux.git 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 Signed-off-by: Herbert Xu --- diff --git a/kernel/padata.c b/kernel/padata.c index 6a519454a5bd..7f895e2b4efb 100644 --- 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))