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authorKrishnasamy, Somasundaram <Somasundaram.Krishnasamy@lsi.com>2011-02-28 18:13:22 -0500
committerJames Bottomley <James.Bottomley@suse.de>2011-03-23 11:36:01 -0500
commitd1e12de804f9d8ad114786ca7c2ce593cba79891 (patch)
tree0a61f39b6a1765c7bd5e5659efd6a697d947725f
parent463b8977ecebf8cf590c33191d43ea0b059381c6 (diff)
[SCSI] ses: Avoid kernel panic when lun 0 is not mapped
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@lsi.com> Signed-off-by: Babu Moger <babu.moger@lsi.com> Cc: stable@kernel.org Signed-off-by: James Bottomley <James.Bottomley@suse.de>
-rw-r--r--include/scsi/scsi_device.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index f171c65dc5a..2d3ec509468 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -462,7 +462,7 @@ static inline int scsi_device_qas(struct scsi_device *sdev)
}
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)