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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EFF39C433EF for ; Mon, 18 Apr 2022 08:59:04 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Khgpb1fXHz3bh9 for ; Mon, 18 Apr 2022 18:59:03 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=ASbWLxm5; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::542; helo=mail-pg1-x542.google.com; envelope-from=hbh25y@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=ASbWLxm5; dkim-atps=neutral Received: from mail-pg1-x542.google.com (mail-pg1-x542.google.com [IPv6:2607:f8b0:4864:20::542]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Khgnp2nRnz2xD4 for ; Mon, 18 Apr 2022 18:58:20 +1000 (AEST) Received: by mail-pg1-x542.google.com with SMTP id u2so17768842pgq.10 for ; Mon, 18 Apr 2022 01:58:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=4bgQnFmcjl9+IwN+gQlxLVi8ouAKrKmz8WNF5PV3MyU=; b=ASbWLxm5SrXl6FJEnCnY7ypSb9qbPSfASDR0vvPiA9At237Dcenk6TB/pzgGPPOcl8 GnJBP7IjWVS+x1pu5WJTda8BBdKW2qsgL/oJZJ5EdHNO6a5mCg5y2JhkIV9yD4tOJkQS A7xUWcNqrT6XrUT2XvapYZdsP8Mx/Sgp4SfVOZQd6iw/LM0PABTV8QxIWbU723o9QCow 7WfP7O1uqRH4DBQtHnfm93EITaBucDW0vo5ZsMaMmzJnUjTlM1HTNPGMllj85ZWQ8AN2 70IbsHguG8RlUgW3ngGirYEDXmpD2h52lGy7s5bXx03itOEws56sz8nSEmaPSSAK216q wg8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=4bgQnFmcjl9+IwN+gQlxLVi8ouAKrKmz8WNF5PV3MyU=; b=AMRqPpe7b2NBWKfojlVBYyaagFzPZx55Dra9EkEuqVeZr+bbl/EJYSb+AMNB7eRBLT DXhhEPQMDsDpsO/IfXZXGDREaHEX7+c25ekWFzX1fRWEHIGMU/1qoMJJdgwuFr8fvZwg kdB6MBlEPRLkQvxkY7GhL+MF3cgjF3I2OcXShihsfSAQwNyu2Xemp7u/HHMVZ+fgzaC0 m3rMDwHAPyKBplQ5PqL97jY8JmipaHVtQDwC+OGUiwV6xQxbCipdzi6mxhSkeYL1CDhJ HHmHtQNYMVrI2V6xdOpKNjF+fObKlonTkOF3XPUDPAIZ7w/ipF2IxIZa5sUx5AIIknxk RJhA== X-Gm-Message-State: AOAM530ozcj6Nq0ICBxg3QEQXRz4Sp6QOQz4hlz0LD8WmcjrzFSLGYDW +TBWnoGQSRI9cUBu+TtDAcU= X-Google-Smtp-Source: ABdhPJyByd0/9Szc/ZHoK0EFbvgxrGROm82aX2DRv5sN8jN6OTmTBcOt/v1wrdF5DDX9RY3E4fscfw== X-Received: by 2002:a05:6a00:2181:b0:4f6:f1b1:1ba7 with SMTP id h1-20020a056a00218100b004f6f1b11ba7mr11227274pfi.73.1650272295573; Mon, 18 Apr 2022 01:58:15 -0700 (PDT) Received: from localhost.localdomain ([103.84.139.165]) by smtp.gmail.com with ESMTPSA id c15-20020a63350f000000b003992202f95fsm12209697pga.38.2022.04.18.01.58.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Apr 2022 01:58:15 -0700 (PDT) From: Hangyu Hua To: fbarrat@linux.ibm.com, ajd@linux.ibm.com, arnd@arndb.de, gregkh@linuxfoundation.org, mpe@ellerman.id.au, alastair@d-silva.org Subject: [PATCH] misc: ocxl: fix possible double free in ocxl_file_register_afu Date: Mon, 18 Apr 2022 16:57:58 +0800 Message-Id: <20220418085758.38145-1-hbh25y@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Hangyu Hua Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" info_release() will be called in device_unregister() when info->dev's reference count is 0. So there is no need to call ocxl_afu_put() and kfree() again. Fix this by adding free_minor() and return to err_unregister error path. Fixes: 75ca758adbaf ("ocxl: Create a clear delineation between ocxl backend & frontend") Signed-off-by: Hangyu Hua --- drivers/misc/ocxl/file.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c index d881f5e40ad9..6777c419a8da 100644 --- a/drivers/misc/ocxl/file.c +++ b/drivers/misc/ocxl/file.c @@ -556,7 +556,9 @@ int ocxl_file_register_afu(struct ocxl_afu *afu) err_unregister: ocxl_sysfs_unregister_afu(info); // safe to call even if register failed + free_minor(info); device_unregister(&info->dev); + return rc; err_put: ocxl_afu_put(afu); free_minor(info); -- 2.25.1