From nobody Fri Dec 19 20:14:40 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AF9CD180A60; Sun, 24 Mar 2024 23:47:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711324052; cv=none; b=HkkpH9NrRpaT3ZzFnqWCQK/2BwpJCckiCwF9hLyF/2WbO1ONtJtF8de0slzuQYXJ0wGyyqnOqUuARTdt6SpU9uobLNfBgz2riDth+xfSnzbYx6POa75eDhitAsWd/rioKJV+rNe51Z28XsWJibvr30F6fqaAaQIzLCXnyQ4ALt4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711324052; c=relaxed/simple; bh=lgXP9On9Wm+u+TZ9h19CicXaNfIlQ6uLGbBbbX9/1rk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fmqQrmVHAWJedvRvM5yLFXwweSZY1jNu2IrAZ5IEklpWZ7LW+ea6lJqytGt/YxkeaQDWHP1tKNjYLWJDOkcEZ4cUoSTPwIzSv0WOyQHFudD24ztehZgfT7xPk3C8feGfRwEQohDrjLEMSD9jKyNyLn9r3MarX/cE7SQZnX/vfSQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=m4ITCWIq; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="m4ITCWIq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ECFB7C433F1; Sun, 24 Mar 2024 23:47:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711324052; bh=lgXP9On9Wm+u+TZ9h19CicXaNfIlQ6uLGbBbbX9/1rk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m4ITCWIq9wNFUsEK8AIN2Rz5wNVFIN0E2lhyN+RRGbnliXce/vhmdrV28kGdRhECG D7ciMYZFgegH4wIbh5gOrPzsDpkxeEy68uSfiyxg+1aBijm+9FjQLjq8eGI7cOfoNb 3NO8slrAUGQDVG+W58lazdEc5+s+Te1rsn5ZlFKwXtGsAcsBCSno84pJ4ob+kw476U lKRzWXhQ+VlE76fZBsOTqoyIHyHycObHyAHXz2eQ2cFemfpvdBXvnSjbRyb6ON/udy ho+5rMCkKREQ/UPnVD7yX3/mUzHPXm3zGoCDYR7PhwylHfiI0mLy559OEDSm6a49v0 bxvupm4FqJLlA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Armin Wolf , "Rafael J . Wysocki" , Sasha Levin Subject: [PATCH 5.4 053/183] ACPI: processor_idle: Fix memory leak in acpi_processor_power_exit() Date: Sun, 24 Mar 2024 19:44:26 -0400 Message-ID: <20240324234638.1355609-54-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240324234638.1355609-1-sashal@kernel.org> References: <20240324234638.1355609-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Armin Wolf [ Upstream commit e18afcb7b2a12b635ac10081f943fcf84ddacc51 ] After unregistering the CPU idle device, the memory associated with it is not freed, leading to a memory leak: unreferenced object 0xffff896282f6c000 (size 1024): comm "swapper/0", pid 1, jiffies 4294893170 hex dump (first 32 bytes): 00 00 00 00 0b 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 8836a742): [] kmalloc_trace+0x29d/0x340 [] acpi_processor_power_init+0xf3/0x1c0 [] __acpi_processor_start+0xd3/0xf0 [] acpi_processor_start+0x2c/0x50 [] really_probe+0xe2/0x480 [] __driver_probe_device+0x78/0x160 [] driver_probe_device+0x1f/0x90 [] __driver_attach+0xce/0x1c0 [] bus_for_each_dev+0x70/0xc0 [] bus_add_driver+0x112/0x210 [] driver_register+0x55/0x100 [] acpi_processor_driver_init+0x3b/0xc0 [] do_one_initcall+0x41/0x300 [] kernel_init_freeable+0x320/0x470 [] kernel_init+0x16/0x1b0 [] ret_from_fork+0x2d/0x50 Fix this by freeing the CPU idle device after unregistering it. Fixes: 3d339dcbb56d ("cpuidle / ACPI : move cpuidle_device field out of the= acpi_processor_power structure") Signed-off-by: Armin Wolf Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/acpi/processor_idle.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 0ea5e677f00ee..0aca77cb8301c 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1531,6 +1531,8 @@ int acpi_processor_power_exit(struct acpi_processor *= pr) acpi_processor_registered--; if (acpi_processor_registered =3D=3D 0) cpuidle_unregister_driver(&acpi_idle_driver); + + kfree(dev); } =20 pr->flags.power_setup_done =3D 0; --=20 2.43.0