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 <steffen.klassert@secunet.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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kernel
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@ -114,7 +114,7 @@ int padata_do_parallel(struct padata_instance *pinst,
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pd = rcu_dereference(pinst->pd);
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err = -EINVAL;
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if (!(pinst->flags & PADATA_INIT))
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if (!(pinst->flags & PADATA_INIT) || pinst->flags & PADATA_INVALID)
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goto out;
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if (!cpumask_test_cpu(cb_cpu, pd->cpumask.cbcpu))
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