linux-kernel - [PATCH 1/2] tracing: Fix minor bugs for __unregister_ftrace_function

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Date:	Tue, 15 Sep 2009 19:06:30 +0900
From:	Atsushi Tsuji <a-tsuji@...jp.nec.com>
To:	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	Ingo Molnar <mingo@...e.hu>, fweisbec@...il.com,
	"Frank Ch. Eigler" <fche@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>, paulus@...ba.org,
	systemtap@...rces.redhat.com
Subject: [PATCH 1/2] tracing: Fix minor bugs for __unregister_ftrace_function_probe

Fix the condition of strcmp for "*".
Also fix NULL pointer dereference when glob is NULL.

Signed-off-by: Atsushi Tsuji <a-tsuji@...jp.nec.com>
---
 kernel/trace/ftrace.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 8c804e2..5ef8f59 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2059,9 +2059,9 @@ __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
 	int i, len = 0;
 	char *search;
 
-	if (glob && (strcmp(glob, "*") || !strlen(glob)))
+	if (glob && (strcmp(glob, "*") == 0 || !strlen(glob)))
 		glob = NULL;
-	else {
+	else if (glob) {
 		int not;
 
 		type = ftrace_setup_glob(glob, strlen(glob), &search, &not);
-- 
1.5.5.1




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