Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757378Ab1DLO7V (ORCPT ); Tue, 12 Apr 2011 10:59:21 -0400 Received: from kroah.org ([198.145.64.141]:57393 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756864Ab1DLOhg (ORCPT ); Tue, 12 Apr 2011 10:37:36 -0400 X-Mailbox-Line: From gregkh@clark.kroah.org Tue Apr 12 07:35:49 2011 Message-Id: <20110412143549.210623700@clark.kroah.org> User-Agent: quilt/0.48-16.4 Date: Tue, 12 Apr 2011 07:34:01 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Somasundaram Krishnasamy , Babu Moger , James Bottomley Subject: [012/105] [SCSI] ses: Avoid kernel panic when lun 0 is not mapped In-Reply-To: <20110412143613.GA19478@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1996 Lines: 51 2.6.38-stable review patch. If anyone has any objections, please let us know. ------------------ From: Krishnasamy, Somasundaram commit d1e12de804f9d8ad114786ca7c2ce593cba79891 upstream. During device discovery, scsi mid layer sends INQUIRY command to LUN 0. If the LUN 0 is not mapped to host, it creates a temporary scsi_device with LUN id 0 and sends REPORT_LUNS command to it. After the REPORT_LUNS succeeds, it walks through the LUN table and adds each LUN found to sysfs. At the end of REPORT_LUNS lun table scan, it will delete the temporary scsi_device of LUN 0. When scsi devices are added to sysfs, it calls add_dev function of all the registered class interfaces. If ses driver has been registered, ses_intf_add() of ses module will be called. This function calls scsi_device_enclosure() to check the inquiry data for EncServ bit. Since inquiry was not allocated for temporary LUN 0 scsi_device, it will cause NULL pointer exception. To fix the problem, sdev->inquiry is checked for NULL before reading it. Signed-off-by: Somasundaram Krishnasamy Signed-off-by: Babu Moger Signed-off-by: James Bottomley Signed-off-by: Greg Kroah-Hartman --- include/scsi/scsi_device.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -461,7 +461,7 @@ static inline int scsi_device_qas(struct } static inline int scsi_device_enclosure(struct scsi_device *sdev) { - return sdev->inquiry[6] & (1<<6); + return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; } static inline int scsi_device_protection(struct scsi_device *sdev) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/