From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0FDF6C4320A for ; Tue, 27 Jul 2021 13:31:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E99D561A64 for ; Tue, 27 Jul 2021 13:30:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236752AbhG0Na6 (ORCPT ); Tue, 27 Jul 2021 09:30:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:57234 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236738AbhG0NUQ (ORCPT ); Tue, 27 Jul 2021 09:20:16 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8F13661ABC; Tue, 27 Jul 2021 13:19:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627391977; bh=CAXc8LZihg7Es+984OqvWcmER3uPykOlQi6083aw+5U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ktEqGYXftZmybaNR253XPfpQAELy5b42ROT0tMyw4u0tlWvfMMSIMyLCzhOvoBJYD 5dOLWaEP6XhNuF8d3dA/TJtQq1t33ll8yd/Z9/NxmVtzJDXR+0q0f+Z8PHjA9lv9ql WG6wu4iel52UC6i23rkpEdpMPWI5mjGPYMDJL0x4k7T8lJRtkcOs/W++9v6TOhw8rN Wye/ABj2M90Pr7R87b9flNMTXdrugk9rCZ3QhSwRSHIEzr/K4LR6nwgu4cXhEqFqdM QHiuvBU31Z7iScJkew+8yItfkugahbVBQ6qSBGEgScgZGnCy7Lrzs5C9rAkz9M6qU8 qxteXEJqrD31w== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Linus Torvalds , Jens Axboe , Daniel Scally , Andy Shevchenko , Sasha Levin , linux-acpi@vger.kernel.org, devel@acpica.org Subject: [PATCH AUTOSEL 5.13 21/21] ACPI: fix NULL pointer dereference Date: Tue, 27 Jul 2021 09:19:08 -0400 Message-Id: <20210727131908.834086-21-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727131908.834086-1-sashal@kernel.org> References: <20210727131908.834086-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Linus Torvalds [ Upstream commit fc68f42aa737dc15e7665a4101d4168aadb8e4c4 ] Commit 71f642833284 ("ACPI: utils: Fix reference counting in for_each_acpi_dev_match()") started doing "acpi_dev_put()" on a pointer that was possibly NULL. That fails miserably, because that helper inline function is not set up to handle that case. Just make acpi_dev_put() silently accept a NULL pointer, rather than calling down to put_device() with an invalid offset off that NULL pointer. Link: https://lore.kernel.org/lkml/a607c149-6bf6-0fd0-0e31-100378504da2@kernel.dk/ Reported-and-tested-by: Jens Axboe Tested-by: Daniel Scally Cc: Andy Shevchenko Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- include/acpi/acpi_bus.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 3a82faac5767..cd98af6ba155 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -716,7 +716,8 @@ static inline struct acpi_device *acpi_dev_get(struct acpi_device *adev) static inline void acpi_dev_put(struct acpi_device *adev) { - put_device(&adev->dev); + if (adev) + put_device(&adev->dev); } #else /* CONFIG_ACPI */ -- 2.30.2