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[209.132.180.67]) by mx.google.com with ESMTP id bw16si4874688pdb.227.2014.07.07.06.45.44; Mon, 07 Jul 2014 06:45:44 -0700 (PDT) Received-SPF: none (google.com: linux-kernel-owner@vger.kernel.org does not designate permitted sender hosts) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753582AbaGGNpf (ORCPT + 27 others); Mon, 7 Jul 2014 09:45:35 -0400 Received: from mail-we0-f169.google.com ([74.125.82.169]:56412 "EHLO mail-we0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753533AbaGGNpc (ORCPT ); Mon, 7 Jul 2014 09:45:32 -0400 Received: by mail-we0-f169.google.com with SMTP id t60so4460057wes.28 for ; Mon, 07 Jul 2014 06:45:31 -0700 (PDT) X-Received: by 10.180.100.200 with SMTP id fa8mr36192978wib.23.1404740731021; Mon, 07 Jul 2014 06:45:31 -0700 (PDT) Received: from rachael.linaro.local ([213.122.173.130]) by mx.google.com with ESMTPSA id e18sm26653901wic.0.2014.07.07.06.45.29 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Jul 2014 06:45:30 -0700 (PDT) From: Jean Pihet To: linux-kernel@vger.kernel.org, linaro-kernel@lists.linaro.org, linux-arm-kernel@lists.infradead.org, Will Deacon Cc: Jiri Olsa , Ingo Molnar , Arnaldo Carvalho de Melo , steve.capper@linaro.org, Jean Pihet Subject: [PATCH 1/3] ARM: perf: Check that current->mm is alive before getting user callchain Date: Mon, 7 Jul 2014 15:45:08 +0200 Message-Id: <1404740710-14691-2-git-send-email-jean.pihet@linaro.org> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1404740710-14691-1-git-send-email-jean.pihet@linaro.org> References: <1404740710-14691-1-git-send-email-jean.pihet@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: jean.pihet@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.220.171 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , An event may occur when an mm is already released. As per commit 20afc60f892d285fde179ead4b24e6a7938c2f1b 'x86, perf: Check that current->mm is alive before getting user callchain' Signed-off-by: Jean Pihet Cc: Will Deacon Acked-by: Will Deacon --- arch/arm/kernel/perf_event.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index 4238bcb..6493c4c 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -590,6 +590,10 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs) } perf_callchain_store(entry, regs->ARM_pc); + + if (!current->mm) + return; + tail = (struct frame_tail __user *)regs->ARM_fp - 1; while ((entry->nr < PERF_MAX_STACK_DEPTH) &&