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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>
This commit is contained in:
Steffen Klassert 2010-07-20 08:51:25 +02:00 committed by Herbert Xu
parent b89661dff5
commit 7424713b83
1 changed files with 1 additions and 1 deletions
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kernel/padata.c
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@ -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))