linux-kernel - [BUGFIX PATCH -tip 2/5] perf probe: Fix strtailcmp() to compare s1[0] and s2[0]

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Message-ID: <20091207170040.19230.37464.stgit@dhcp-100-2-132.bos.redhat.com>
Date:	Mon, 07 Dec 2009 12:00:40 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	lkml <linux-kernel@...r.kernel.org>
Cc:	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	"Juha Leppanen" <juha_motorsportcom@...kku.com>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: [BUGFIX PATCH -tip 2/5] perf probe: Fix strtailcmp() to compare s1[0]
	and s2[0]

From: Juha Leppanen <juha_motorsportcom@...kku.com>

Fix strtailcmp() to compare s1[0] and s2[0].
strtailcmp() returns 0 if "a" and "b" or "a" and "ab", it's
a wrong behavior. This patch fixes it.

Signed-off-by: "Juha Leppanen" <juha_motorsportcom@...kku.com>
Reported-by: "Juha Leppanen" <juha_motorsportcom@...kku.com>
Acked-by: Masami Hiramatsu <mhiramat@...hat.com>
---

 tools/perf/util/probe-finder.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 293cdfc..4585f1d 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -106,7 +106,7 @@ static int strtailcmp(const char *s1, const char *s2)
 {
 	int i1 = strlen(s1);
 	int i2 = strlen(s2);
-	while (--i1 > 0 && --i2 > 0) {
+	while (--i1 >= 0 && --i2 >= 0) {
 		if (s1[i1] != s2[i2])
 			return s1[i1] - s2[i2];
 	}


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com
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