Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966305AbdIZG6V (ORCPT ); Tue, 26 Sep 2017 02:58:21 -0400 Received: from mx2.suse.de ([195.135.220.15]:34547 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S965840AbdIZG6U (ORCPT ); Tue, 26 Sep 2017 02:58:20 -0400 From: Johannes Thumshirn To: "Martin K . Petersen" Cc: Linux SCSI Mailinglist , Linux Kernel Mailinglist , Hannes Reinecke , Bart Van Assche , Christoph Hellwig , Johannes Thumshirn Subject: [PATCH v2 1/1] scsi: fc: check for rport presence in fc_block_scsi_eh Date: Tue, 26 Sep 2017 08:58:09 +0200 Message-Id: <20170926065809.7980-1-jthumshirn@suse.de> X-Mailer: git-send-email 2.13.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1031 Lines: 35 Coverity-scan recently found a possible NULL pointer dereference in fc_block_scsi_eh() as starget_to_rport() either returns the rport for the startget or NULL. While it is rather unlikely to have fc_block_scsi_eh() called without an rport associated it's a good idea to catch potential misuses of the API gracefully. Signed-off-by: Johannes Thumshirn Reviewed-by: Bart Van Assche --- Changes since v1: - s/WARN_ON/WARN_ON_ONCE/ (Bart) --- drivers/scsi/scsi_transport_fc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c index ba9d70f8a6a1..38abff7b5dbc 100644 --- a/drivers/scsi/scsi_transport_fc.c +++ b/drivers/scsi/scsi_transport_fc.c @@ -3328,6 +3328,9 @@ int fc_block_scsi_eh(struct scsi_cmnd *cmnd) { struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device)); + if (WARN_ON_ONCE(!rport)) + return 0; + return fc_block_rport(rport); } EXPORT_SYMBOL(fc_block_scsi_eh); -- 2.13.5