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[CPUFREQ] Fix use after free of struct powernow_k8_data

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Easy fix for a regression introduced in 2.6.31.

On managed CPUs the cpufreq.c core will call driver->exit(cpu) on the
managed cpus and powernow_k8 will free the core's data.

Later driver->get(cpu) function might get called trying to read out the
current freq of a managed cpu and the NULL pointer check does not work on
the freed object -> better set it to NULL.

->get() is unsigned and must return 0 as invalid frequency.

Reference:
http://bugzilla.kernel.org/show_bug.cgi?id=14391

Signed-off-by: Thomas Renninger <trenn@suse.de>
Tested-by: Michal Schmidt <mschmidt@redhat.com>
CC: stable@kernel.org
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Thomas Renninger 2009-12-14 11:44:15 +01:00 committed by Dave Jones
parent 292e0041c3
commit 557a701c16
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kernel/cpu/cpufreq/powernow-k8.c
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@ -1356,6 +1356,7 @@ static int __devexit powernowk8_cpu_exit(struct cpufreq_policy *pol)
kfree(data->powernow_table);
kfree(data);
per_cpu(powernow_data, pol->cpu) = NULL;
return 0;
}
@ -1375,7 +1376,7 @@ static unsigned int powernowk8_get(unsigned int cpu)
int err;
if (!data)
return -EINVAL;
return 0;
smp_call_function_single(cpu, query_values_on_cpu, &err, true);
if (err)