blob: e7bc119ac3035a2595bbba69f30a19002dac0ab0 [file] [log] [blame]
From d1e12de804f9d8ad114786ca7c2ce593cba79891 Mon Sep 17 00:00:00 2001
From: Krishnasamy, Somasundaram <>
Date: Mon, 28 Feb 2011 18:13:22 -0500
Subject: [SCSI] ses: Avoid kernel panic when lun 0 is not mapped
From: Krishnasamy, Somasundaram <>
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 <>
Signed-off-by: Babu Moger <>
Signed-off-by: James Bottomley <>
Signed-off-by: Greg Kroah-Hartman <>
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)