linux-kernel - [PATCH RESEND] perf daemon: Fix file leak in daemon_session_

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Date: Thu,  9 May 2024 17:34:24 -0700
From: Samasth Norway Ananda <samasth.norway.ananda@...cle.com>
To: namhyung@...nel.org, acme@...nel.org
Cc: peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        irogers@...gle.com, adrian.hunter@...el.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        samasth.norway.ananda@...cle.com
Subject: [PATCH RESEND] perf daemon: Fix file leak in daemon_session__control

The open() function returns -1 on error.
'control' and 'ack' both initialized with open() and further
validated with 'if' statement. 'if (!control)' would evaluate
to 'true' if returned value on error were '0' but it is actually '-1'.

Fixes: edcaa47958c7 ("perf daemon: Add 'ping' command")
Signed-off-by: Samasth Norway Ananda <samasth.norway.ananda@...cle.com>
---
Found this error through static analysis. This has only been compile
tested.
---
 tools/perf/builtin-daemon.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index 83954af36753..de76bbc50bfb 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -523,7 +523,7 @@ static int daemon_session__control(struct daemon_session *session,
 		  session->base, SESSION_CONTROL);
 
 	control = open(control_path, O_WRONLY|O_NONBLOCK);
-	if (!control)
+	if (control < 0)
 		return -1;
 
 	if (do_ack) {
@@ -532,7 +532,7 @@ static int daemon_session__control(struct daemon_session *session,
 			  session->base, SESSION_ACK);
 
 		ack = open(ack_path, O_RDONLY, O_NONBLOCK);
-		if (!ack) {
+		if (ack < 0) {
 			close(control);
 			return -1;
 		}
-- 
2.42.0