Commit 4ab14323 authored by Jan Stancek's avatar Jan Stancek Committed by Greg Kroah-Hartman

powerpc: fix memory corruption by pnv_alloc_idle_core_states

commit d52356e7 upstream.

Space allocated for paca is based off nr_cpu_ids,
but pnv_alloc_idle_core_states() iterates paca with
cpu_nr_cores()*threads_per_core, which is using NR_CPUS.

This causes pnv_alloc_idle_core_states() to write over memory,
which is outside of paca array and may later lead to various panics.

Fixes: 7cba160a (powernv/cpuidle: Redesign idle states management)
Signed-off-by: default avatarJan Stancek <jstancek@redhat.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarPreet U. Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 511dffb4
...@@ -55,7 +55,7 @@ static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads) ...@@ -55,7 +55,7 @@ static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads)
static inline int cpu_nr_cores(void) static inline int cpu_nr_cores(void)
{ {
return NR_CPUS >> threads_shift; return nr_cpu_ids >> threads_shift;
} }
static inline cpumask_t cpu_online_cores_map(void) static inline cpumask_t cpu_online_cores_map(void)
......
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