From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jan Stancek , Michael Ellerman , "Preet U. Murthy" Subject: [PATCH 3.19 039/101] powerpc: fix memory corruption by pnv_alloc_idle_core_states Date: Fri, 17 Apr 2015 15:28:27 +0200 Message-Id: <20150417132516.100742349@linuxfoundation.org> In-Reply-To: <20150417132514.379828774@linuxfoundation.org> References: <20150417132514.379828774@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jan Stancek 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 Signed-off-by: Michael Ellerman Signed-off-by: Preet U. Murthy Signed-off-by: Greg Kroah-Hartman --- 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)