6.6-stable review patch. If anyone has any objections, please let me know.
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From: Samasth Norway Ananda samasth.norway.ananda@oracle.com
[ Upstream commit 09541603462c399c7408d50295db99b4b8042eaa ]
The open() function returns -1 on error.
The 'control' and 'ack' file descriptors are 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: edcaa47958c7438b ("perf daemon: Add 'ping' command") Signed-off-by: Samasth Norway Ananda samasth.norway.ananda@oracle.com Cc: Adrian Hunter adrian.hunter@intel.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Ian Rogers irogers@google.com Cc: Ingo Molnar mingo@redhat.com Cc: Jiri Olsa jolsa@kernel.org Cc: Mark Rutland mark.rutland@arm.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Link: https://lore.kernel.org/r/20240510003424.2016914-1-samasth.norway.ananda@ora... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 83954af36753a..de76bbc50bfbc 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; }