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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C306FC433EF for ; Tue, 30 Nov 2021 17:18:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244595AbhK3RWB (ORCPT ); Tue, 30 Nov 2021 12:22:01 -0500 Received: from mta-p7.oit.umn.edu ([134.84.196.207]:49916 "EHLO mta-p7.oit.umn.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239078AbhK3RWA (ORCPT ); Tue, 30 Nov 2021 12:22:00 -0500 X-Greylist: delayed 400 seconds by postgrey-1.27 at vger.kernel.org; Tue, 30 Nov 2021 12:22:00 EST Received: from localhost (unknown [127.0.0.1]) by mta-p7.oit.umn.edu (Postfix) with ESMTP id 4J3TKX5qnNz9xZ3C for ; Tue, 30 Nov 2021 17:12:00 +0000 (UTC) X-Virus-Scanned: amavisd-new at umn.edu Received: from mta-p7.oit.umn.edu ([127.0.0.1]) by localhost (mta-p7.oit.umn.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Tq4uVKcP_kUj for ; Tue, 30 Nov 2021 11:12:00 -0600 (CST) Received: from mail-pf1-f197.google.com (mail-pf1-f197.google.com [209.85.210.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mta-p7.oit.umn.edu (Postfix) with ESMTPS id 4J3TKX3r39z9xZ3L for ; Tue, 30 Nov 2021 11:12:00 -0600 (CST) DMARC-Filter: OpenDMARC Filter v1.3.2 mta-p7.oit.umn.edu 4J3TKX3r39z9xZ3L DKIM-Filter: OpenDKIM Filter v2.11.0 mta-p7.oit.umn.edu 4J3TKX3r39z9xZ3L Received: by mail-pf1-f197.google.com with SMTP id m16-20020a628c10000000b004a282d715b2so13208259pfd.11 for ; Tue, 30 Nov 2021 09:12:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=umn.edu; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=V0lWGpYWyNpOYPxuRnSF3f8gDAFkgkH4nbP8crWjnQc=; b=mpUcODJ4kpde9Ay7Z/krQyfktHenkFWFmQDS1w2AgoRAY3OABAVNotR4Qf0OmlvfUZ 1NyBd2+ivU57FrKLRsu4L5zm1mxOvHK2ZQFcEfdSaimtmL26gxkPGarzPQ3w2H7YmEN8 zJmebwb793bOf0EE+JCw22LFOLO01H2DqptjFlEcW7SHfVU5PKzz72trj+0es4RvgsCj J748A2Ft+WA2Y8A0xtwwnKQYcy+e+rHPIHGoi6rs48IcSaNqeHutinnctETP9RNNAxt7 8Hoisxxnj1Evfb8tr9vEcNjVKXzB2DMisXyIA/j5rR+gZGcvDvEqm9V4/3WiFE9PhO52 7I/A== 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=V0lWGpYWyNpOYPxuRnSF3f8gDAFkgkH4nbP8crWjnQc=; b=usjKZDPpdRDQ8ARLfYdWwg2gZY3eWuvrm/UH1rLXzoc9I8VPOQXtdD0hiY+ISbrmp+ jmlN5Z4CKhmAqpwESgpJJ5vFx+LVCynhbOBuxZcqK5iljAujZdtXij5TMm1nDzBFuafY 0Utgdt16poeMhcnN4PUHE8wnhR6+EkOLApxQImy0KbsHWHzqxUG9rFX/d+zfTshIwHkk /9lGL7lN+UJ/pyjXhj5A0Vamry5qQwhRmCQv/o52M1wiJjcpgjO2h18BDIrm8hHqbJaD bP12avK1Nnb5qT8FOoyPkqVvxnPwzLNTgvgSN4daRirl2uRDLEZEw0PyKdCn7JMsLi/W KLng== X-Gm-Message-State: AOAM5329mIV/50YbdoR7vcxdDLB5E7WK/4Gu5RPt5tSrh+okjmqwpeBH Czq67Qs0TSW8PJc73VZETSjEA3kTF/VJUhTsV+xp+1HIit4NWWy+1SoODENS3aqXuRDcKcTIiHM wroAHdhDQ+9N43MMwPqKZ4Y3Dyg== X-Received: by 2002:a17:902:c410:b0:142:2506:cb5b with SMTP id k16-20020a170902c41000b001422506cb5bmr495037plk.36.1638292319707; Tue, 30 Nov 2021 09:11:59 -0800 (PST) X-Google-Smtp-Source: ABdhPJz2fXuTGnSmdHQRZFTjtJ71nlh0+Fs1qffHsWrGRYAwEWvVrGJGew4rmr+xWPQ0i+cAagA6qQ== X-Received: by 2002:a17:902:c410:b0:142:2506:cb5b with SMTP id k16-20020a170902c41000b001422506cb5bmr494998plk.36.1638292319396; Tue, 30 Nov 2021 09:11:59 -0800 (PST) Received: from zqy787-GE5S.lan ([36.7.42.137]) by smtp.gmail.com with ESMTPSA id p2sm3124816pja.55.2021.11.30.09.11.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Nov 2021 09:11:59 -0800 (PST) From: Zhou Qingyang To: zhou1615@umn.edu Cc: kjlu@umn.edu, Hannes Reinecke , "James E.J. Bottomley" , "Martin K. Petersen" , Johannes Thumshirn , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] scsi: libfc: Fix a NULL pointer dereference in fc_lport_ptp_setup() Date: Wed, 1 Dec 2021 01:10:49 +0800 Message-Id: <20211130171049.199111-1-zhou1615@umn.edu> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org In fc_lport_ptp_setup(), fc_rport_create() is assigned to lport->ptp_rdata and there is a dereference of in fc_lport_ptp_setup(), which could lead to a NULL pointer dereference on failure of fc_rport_create(). Fix this bug by adding a check of fc_rport_create(). This bug was found by a static analyzer. The analysis employs differential checking to identify inconsistent security operations (e.g., checks or kfrees) between two code paths and confirms that the inconsistent operations are not recovered in the current function or the callers, so they constitute bugs. Note that, as a bug found by static analysis, it can be a false positive or hard to trigger. Multiple researchers have cross-reviewed the bug. Builds with CONFIG_LIBFC=m show no new warnings, and our static analyzer no longer warns about this code. Fixes: 2580064b5ec6 ("scsi: libfc: Replace ->rport_create callback with function call") Signed-off-by: Zhou Qingyang --- drivers/scsi/libfc/fc_lport.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c index 19cd4a95d354..5cd716afb711 100644 --- a/drivers/scsi/libfc/fc_lport.c +++ b/drivers/scsi/libfc/fc_lport.c @@ -241,6 +241,13 @@ static void fc_lport_ptp_setup(struct fc_lport *lport, } mutex_lock(&lport->disc.disc_mutex); lport->ptp_rdata = fc_rport_create(lport, remote_fid); + if (!lport->ptp_rdata) { + mutex_unlock(&lport->disc.disc_mutex); + printk(KERN_WARNING "libfc: Failed to allocate for the port (%6.6x)\n", + remote_fid); + return; + } + kref_get(&lport->ptp_rdata->kref); lport->ptp_rdata->ids.port_name = remote_wwpn; lport->ptp_rdata->ids.node_name = remote_wwnn; -- 2.25.1