linux-kernel - [PATCH 3.14 031/140] tracing/uprobes: Fix uprobe_cpu

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Message-Id: <20140529043053.386069244@linuxfoundation.org>
Date:	Wed, 28 May 2014 21:32:50 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 3.14 031/140] tracing/uprobes: Fix uprobe_cpu_buffer memory leak

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "zhangwei(Jovi)" <jovi.zhangwei@...wei.com>

commit 6ea6215fe394e320468589d9bba464a48f6d823a upstream.

Forgot to free uprobe_cpu_buffer percpu page in uprobe_buffer_disable().

Link: http://lkml.kernel.org/p/534F8B3F.1090407@huawei.com

Acked-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@...wei.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/trace/trace_uprobe.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -728,9 +728,15 @@ static int uprobe_buffer_enable(void)
 
 static void uprobe_buffer_disable(void)
 {
+	int cpu;
+
 	BUG_ON(!mutex_is_locked(&event_mutex));
 
 	if (--uprobe_buffer_refcnt == 0) {
+		for_each_possible_cpu(cpu)
+			free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer,
+							     cpu)->buf);
+
 		free_percpu(uprobe_cpu_buffer);
 		uprobe_cpu_buffer = NULL;
 	}


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