This is a note to let you know that I've just added the patch titled
powerpc: fix memory corruption by pnv_alloc_idle_core_states
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-fix-memory-corruption-by-pnv_alloc_idle_core_states.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d52356e7f48e400ca258c6763a232a92fa82ff68 Mon Sep 17 00:00:00 2001
From: Jan Stancek <jstancek@xxxxxxxxxx>
Date: Tue, 31 Mar 2015 18:11:46 +0200
Subject: powerpc: fix memory corruption by pnv_alloc_idle_core_states
From: Jan Stancek <jstancek@xxxxxxxxxx>
commit d52356e7f48e400ca258c6763a232a92fa82ff68 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: 7cba160ad789 (powernv/cpuidle: Redesign idle states management)
Signed-off-by: Jan Stancek <jstancek@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Preet U. Murthy <preeti@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/cputhreads.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/include/asm/cputhreads.h
+++ b/arch/powerpc/include/asm/cputhreads.h
@@ -55,7 +55,7 @@ static inline cpumask_t cpu_thread_mask_
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)
Patches currently in stable-queue which might be from jstancek@xxxxxxxxxx are
queue-3.19/powerpc-fix-memory-corruption-by-pnv_alloc_idle_core_states.patch
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