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[81.240.193.216]) by mx.google.com with ESMTPSA id 19sm21920749wjz.3.2014.06.27.07.58.05 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 27 Jun 2014 07:58:05 -0700 (PDT) From: Jean Pihet To: Will Deacon , linux-arm-kernel@lists.infradead.org, linaro-kernel@lists.linaro.org, Sneha Priya , linux-kernel@vger.kernel.org, Jiri Olsa , Arnaldo Carvalho de Melo Cc: Jean Pihet Subject: [PATCH 1/3] ARM: perf: Check that current->mm is alive before getting user callchain Date: Fri, 27 Jun 2014 16:57:45 +0200 Message-Id: <1403881067-22690-2-git-send-email-jean.pihet@linaro.org> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1403881067-22690-1-git-send-email-jean.pihet@linaro.org> References: <1403881067-22690-1-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 209.85.128.172 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) &&