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arm/mach-vexpress: array accessed out of bounds

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dcscb_allcpus_mask is an array of size 2.

The index variable cluster has to be checked against this limit
before accessing the array.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
This commit is contained in:
Heinrich Schuchardt 2014-04-14 08:42:01 +01:00 committed by Pawel Moll
parent 6b4ed8b00e
commit bb6dd5757c
1 changed files with 5 additions and 2 deletions
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7
arch/arm/mach-vexpress/dcscb.c
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@ -51,12 +51,14 @@ static int dcscb_allcpus_mask[2];
static int dcscb_power_up(unsigned int cpu, unsigned int cluster)
{
unsigned int rst_hold, cpumask = (1 << cpu);
unsigned int all_mask = dcscb_allcpus_mask[cluster];
unsigned int all_mask;
pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
if (cpu >= 4 || cluster >= 2)
return -EINVAL;
all_mask = dcscb_allcpus_mask[cluster];
/*
* Since this is called with IRQs enabled, and no arch_spin_lock_irq
* variant exists, we need to disable IRQs manually here.
@ -101,11 +103,12 @@ static void dcscb_power_down(void)
cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
cpumask = (1 << cpu);
all_mask = dcscb_allcpus_mask[cluster];
pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
BUG_ON(cpu >= 4 || cluster >= 2);
all_mask = dcscb_allcpus_mask[cluster];
__mcpm_cpu_going_down(cpu, cluster);
arch_spin_lock(&dcscb_lock);