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Tue, 20 Oct 2026 09:13:29 -0700 (PDT) Received: from localhost.localdomain ([98.148.34.5]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1831b859142sm37128393c88.18.2026.10.20.09.13.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Oct 2026 09:13:28 -0700 (PDT) From: Hungyu Lin To: anna-maria@linutronix.de, frederic@kernel.org, tglx@kernel.org Cc: linux-kernel@vger.kernel.org, Hungyu Lin Subject: [PATCH] posix-timers: Accept NULL clock_getres() output in stubs Date: Tue, 20 Oct 2026 16:11:21 +0000 Message-ID: <20261020161121.85042-1-dennylin0707@gmail.com> X-Mailer: git-send-email 2.43.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit With CONFIG_POSIX_TIMERS disabled, clock_getres() returns -EFAULT for a supported clock when the result pointer is NULL. POSIX permits a NULL result pointer to suppress returning the clock resolution. Only copy the result when a destination is provided, in both the native and time32 stubs. This matches the full POSIX timer implementation and preserves clock ID validation. Fixes: baa73d9e478f ("posix-timers: Make them configurable") Fixes: d822cdcce43f ("posix-timers: Move compat versions of clock_gettime/settime/getres") Signed-off-by: Hungyu Lin --- kernel/time/posix-stubs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c index 9b6fcb8d85e7..5a27335a917e 100644 --- a/kernel/time/posix-stubs.c +++ b/kernel/time/posix-stubs.c @@ -83,7 +83,7 @@ SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct __kernel_time case CLOCK_REALTIME: case CLOCK_MONOTONIC: case CLOCK_BOOTTIME: - if (put_timespec64(&rtn_tp, tp)) + if (tp && put_timespec64(&rtn_tp, tp)) return -EFAULT; return 0; default: @@ -166,7 +166,7 @@ SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock, case CLOCK_REALTIME: case CLOCK_MONOTONIC: case CLOCK_BOOTTIME: - if (put_old_timespec32(&rtn_tp, tp)) + if (tp && put_old_timespec32(&rtn_tp, tp)) return -EFAULT; return 0; default: base-commit: 348f54c435bf3177baa78201952810b255d44b30