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| author | Krishnasamy, Somasundaram <Somasundaram.Krishnasamy@lsi.com> | 2011-02-28 18:13:22 -0500 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2011-03-23 11:36:01 -0500 |
| commit | d1e12de804f9d8ad114786ca7c2ce593cba79891 (patch) | |
| tree | 0a61f39b6a1765c7bd5e5659efd6a697d947725f | |
| parent | 463b8977ecebf8cf590c33191d43ea0b059381c6 (diff) | |
| download | linux-stable-d1e12de804f9d8ad114786ca7c2ce593cba79891.tar.gz linux-stable-d1e12de804f9d8ad114786ca7c2ce593cba79891.tar.bz2 linux-stable-d1e12de804f9d8ad114786ca7c2ce593cba79891.zip | |
[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.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index f171c65dc5a8..2d3ec5094685 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) |