From nobody Wed Oct 15 22:45:56 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 673F7175CA5; Sun, 24 Mar 2024 23:36:43 +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=1711323404; cv=none; b=pHVCIR/Pppbui61QnwIkugByj5MOib9xAYHJIwY4yJhn3IECVkXs9PSVhoP88X57vLLvIqq0JDhPcQLchHge/M8k5gtd4mxEJWFoCybx31kfR6izBt/7/EB3B26ij/A6CGAA8TDyaB9yRh006XljjtFH/mp6nDQRW9jVe43rPfg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711323404; c=relaxed/simple; bh=CqA3eUdPBF/be+v+k2NASIKCC/1AGo7SsTS6DXb7YYA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=I8HBZrILlQg0NYPHesS+jeiqBDcO96G5hfYkCQCJqNmc+aaEYxSF3BHiVYh3/1TEP21AUeOneVuJpLOM5z+cU1Gs91rDGu8CWONonJTGLH+hRQHr4ZiUOHMZQUzU6hW4CiGbOLzCYqro7iBggqWltZ2IPzcez4Hlj2rNir1OFyA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FDsqQfsX; 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="FDsqQfsX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A4E58C43390; Sun, 24 Mar 2024 23:36:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711323403; bh=CqA3eUdPBF/be+v+k2NASIKCC/1AGo7SsTS6DXb7YYA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FDsqQfsXxBfVnE+pzTmWHUEzmKaKNley0S3FEV1E7ONbNL48Ij65C34Dm7erSUb4X EV+LIOVS92Hm1Zs+xh1kvxFLr39Monghfa/+G+2im2GPfKmtEV/Ke1YL25Y8AZMAbs L5D3kMH23u78LeodhYPkOWOwU4sprFaHS6K/GgprYZQtIY/e63/joKRjhOjJwDk/3W rsnzZ2kpd2vhE5qdRlpCWaq6A3Q4Er5kDZTcOYl2HFju211LoTn/oZNRAkMD9l+tNR 2e1+Wt/gwlCN5hHHQ4Cpaf/90vZtsfdxEC8wOSp0i5WMGXeBJ13L0v1/goFyKMHJQk PxFQ0JFKlsEoA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Armin Wolf , "Rafael J . Wysocki" , Sasha Levin Subject: [PATCH 5.15 104/317] ACPI: processor_idle: Fix memory leak in acpi_processor_power_exit() Date: Sun, 24 Mar 2024 19:31:24 -0400 Message-ID: <20240324233458.1352854-105-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240324233458.1352854-1-sashal@kernel.org> References: <20240324233458.1352854-1-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 e9116db1e3527..4cb44d80bf520 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -1424,6 +1424,8 @@ 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