linux-kernel - [PATCH] perf probe: check if *ptr2 is zero and not ptr2

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Message-Id: <20161003103431.18534-1-colin.king@canonical.com>
Date:   Mon,  3 Oct 2016 11:34:31 +0100
From:   Colin King <colin.king@...onical.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        Wang Nan <wangnan0@...wei.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] perf probe: check if *ptr2 is zero and not ptr2

From: Colin Ian King <colin.king@...onical.com>

Static anaylsis with cppcheck detected an incorrect comparison:
[tools/perf/util/probe-event.c:216]: (warning) Char literal compared with
pointer 'ptr2'. Did you intend to dereference it?

Dereference ptr2 for the comparison to fix this.

Fixes: 35726d3a4ca9 ("perf probe: Fix to cut off incompatible chars from group name")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 tools/perf/util/probe-event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index fcfbef0..d281ae2 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -213,7 +213,7 @@ static int convert_exec_to_group(const char *exec, char **result)
 		goto out;
 	}
 
-	for (ptr2 = ptr1; ptr2 != '\0'; ptr2++) {
+	for (ptr2 = ptr1; *ptr2 != '\0'; ptr2++) {
 		if (!isalnum(*ptr2) && *ptr2 != '_') {
 			*ptr2 = '\0';
 			break;
-- 
2.9.3