linux-kernel - [10/71] [SCSI] ses: Avoid kernel panic when lun 0 is not mapped

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Date:	Wed, 13 Apr 2011 09:09:33 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Somasundaram Krishnasamy <Somasundaram.Krishnasamy@....com>,
	Babu Moger <babu.moger@....com>,
	James Bottomley <James.Bottomley@...e.de>
Subject: [10/71] [SCSI] ses: Avoid kernel panic when lun 0 is not mapped

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Krishnasamy, Somasundaram <Somasundaram.Krishnasamy@....com>

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 <Somasundaram.Krishnasamy@....com>
Signed-off-by: Babu Moger <babu.moger@....com>
Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 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
@@ -450,7 +450,7 @@ 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)

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