linux-kernel - [RFC][PATCH v2 1/7] trace: fix the glob match in __unregister_ftrace_function

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Message-Id: <1423195215-25134-1-git-send-email-viro@ZenIV.linux.org.uk>
Date:	Fri,  6 Feb 2015 04:00:09 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [RFC][PATCH v2 1/7] trace: fix the glob match in __unregister_ftrace_function_probe()

From: Al Viro <viro@...iv.linux.org.uk>

For patterns starting with '*' we need to match against 'search', not
'glob'.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 kernel/trace/ftrace.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 224e768..67ecd14 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3761,12 +3761,10 @@ __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
 	char str[KSYM_SYMBOL_LEN];
 	int type = MATCH_FULL;
 	int i, len = 0;
-	char *search;
+	char *search = NULL;
 	int ret;
 
-	if (glob && (strcmp(glob, "*") == 0 || !strlen(glob)))
-		glob = NULL;
-	else if (glob) {
+	if (glob && *glob && strcmp(glob, "*") != 0) {
 		int not;
 
 		type = filter_parse_regex(glob, strlen(glob), &search, &not);
@@ -3799,10 +3797,10 @@ __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
 				continue;
 
 			/* do this last, since it is the most expensive */
-			if (glob) {
+			if (search) {
 				kallsyms_lookup(entry->ip, NULL, NULL,
 						NULL, str);
-				if (!ftrace_match(str, glob, len, type))
+				if (!ftrace_match(str, search, len, type))
 					continue;
 			}
 
-- 
2.1.4

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