| From 6ea6215fe394e320468589d9bba464a48f6d823a Mon Sep 17 00:00:00 2001 |
| From: "zhangwei(Jovi)" <jovi.zhangwei@huawei.com> |
| Date: Thu, 17 Apr 2014 16:05:19 +0800 |
| Subject: tracing/uprobes: Fix uprobe_cpu_buffer memory leak |
| |
| From: "zhangwei(Jovi)" <jovi.zhangwei@huawei.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@kernel.org> |
| Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com> |
| Signed-off-by: Steven Rostedt <rostedt@goodmis.org> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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; |
| } |
