linux-kernel - [PATCH] perf tools: Add missing else to cmd

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Date:   Mon, 26 Jun 2023 22:16:05 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org
Subject: [PATCH] perf tools: Add missing else to cmd_daemon subcommand condition

Namhyung reported segfault in perf daemon start command.

It's caused by extra check on argv[0] which is set to NULL by previous
__cmd_start call. Adding missing else to skip the extra check.

Fixes: 92294b906e6c ("perf daemon: Dynamically allocate path to perf")
Reported-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/builtin-daemon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index f5674d824a40..83954af36753 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -1524,7 +1524,7 @@ int cmd_daemon(int argc, const char **argv)
 	if (argc) {
 		if (!strcmp(argv[0], "start"))
 			ret = __cmd_start(&__daemon, daemon_options, argc, argv);
-		if (!strcmp(argv[0], "signal"))
+		else if (!strcmp(argv[0], "signal"))
 			ret = __cmd_signal(&__daemon, daemon_options, argc, argv);
 		else if (!strcmp(argv[0], "stop"))
 			ret = __cmd_stop(&__daemon, daemon_options, argc, argv);
-- 
2.41.0