[PATCH 4/4] crypto: pcrypt - Dont calulate a callback cpu on empty callback cpumask

Steffen Klassert
2010-07-20T06:49:22Z

If the callback cpumask is empty, we crash with a division by zero
when we try to calculate a callback cpu. So we don't update the callback
cpu in pcrypt_do_parallel if the callback cpumask is empty.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
crypto/pcrypt.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
index 7153a50..794c172 100644
--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -82,6 +82,9 @@ static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
if (cpumask_test_cpu(cpu, cpumask->mask))
goto out;

+ if (!cpumask_weight(cpumask->mask))
+ goto out;
+
cpu_index = cpu % cpumask_weight(cpumask->mask);

cpu = cpumask_first(cpumask->mask);
--
1.5.6.5