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| author | Krishnasamy, Somasundaram <Somasundaram.Krishnasamy@lsi.com> | 2011-02-28 18:13:22 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-14 16:53:20 -0700 |
| commit | 40001773632081282f51a4cf582e0bb7fee7c225 (patch) | |
| tree | 8aabf415b2a31451f2bdd8c294af907cd601378f | |
| parent | 56b7b7b97d500a63adb3bdb2a403d041b0f287be (diff) | |
| download | lwn-40001773632081282f51a4cf582e0bb7fee7c225.tar.gz lwn-40001773632081282f51a4cf582e0bb7fee7c225.zip | |
ses: Avoid kernel panic when lun 0 is not mapped
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@lsi.com>
Signed-off-by: Babu Moger <babu.moger@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@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 f097ae340bc1..de8e180dc2d5 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -446,7 +446,7 @@ 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) |