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authorKrishnasamy, Somasundaram <Somasundaram.Krishnasamy@lsi.com>2011-02-28 18:13:22 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-04-14 13:01:59 -0700
commitc289b973f884ea230b38b7aa1878adc2c77a32f2 (patch)
treeeb03e5c6bf98ae39c24e786bc26ea8a3602a1509
parente7f208ebb98b445a92f0bbc2d420599671450f88 (diff)
downloadlinux-linaro-android-c289b973f884ea230b38b7aa1878adc2c77a32f2.tar.gz
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.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 85867dcde33..bfd36ff14c9 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -461,7 +461,7 @@ 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)