linux-kernel - [tip:tracing/ftrace] ftrace: avoid double-free of dyn

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Date:	Fri, 13 Mar 2009 09:33:29 GMT
From:	Zhaolei <zhaolei@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	rostedt@...dmis.org, zhaolei@...fujitsu.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:tracing/ftrace] ftrace: avoid double-free of dyn_ftrace

Commit-ID:  b00f0b6dc1773b4c8f538503247da050b5ea631b
Gitweb:     http://git.kernel.org/tip/b00f0b6dc1773b4c8f538503247da050b5ea631b
Author:     Zhaolei <zhaolei@...fujitsu.com>
AuthorDate: Fri, 13 Mar 2009 17:14:01 +0800
Commit:     Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 13 Mar 2009 10:25:06 +0100

ftrace: avoid double-free of dyn_ftrace

If dyn_ftrace is freed before ftrace_release(), ftrace_release()
will free it again and make ftrace_free_records wrong.

Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com>
Cc: "Steven Rostedt ;" <rostedt@...dmis.org>
LKML-Reference: <49BA23D9.1050900@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/trace/ftrace.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index d33d306..26c45aa 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -356,7 +356,8 @@ void ftrace_release(void *start, unsigned long size)
 
 	mutex_lock(&ftrace_lock);
 	do_for_each_ftrace_rec(pg, rec) {
-		if ((rec->ip >= s) && (rec->ip < e))
+		if ((rec->ip >= s) && (rec->ip < e) &&
+		    !(rec->flags & FTRACE_FL_FREE))
 			ftrace_free_rec(rec);
 	} while_for_each_ftrace_rec();
 	mutex_unlock(&ftrace_lock);
--
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