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SubjectRE: [PATCH] mpt2sas: Fix null reference in recovery_delete_devices
A similar patch to fix this issue was already posted by Dan Carpenter.  

Regards,
Nagalakshmi


-----Original Message-----
From: Yinghai Lu [mailto:yinghai.lu@oracle.com]
Sent: Thursday, November 10, 2011 9:35 PM
To: James E.J. Bottomley; Nandigama, Nagalakshmi
Cc: Desai, Kashyap; Moore, Eric; linux-scsi@vger.kernel.org; linux-kernel@vger.kernel.org
Subject: [PATCH] mpt2sas: Fix null reference in recovery_delete_devices


Got panic:
[ 752.590700] BUG: unable to handle kernel NULL pointer dereference at 00000000000000f6
[ 752.598542] IP: [<ffffffff8160b5f3>] mpt2sas_scsih_reset_handler+0x168/0x183
[ 752.605595] PGD 175d43067 PUD 175d44067 PMD 0
[ 752.610081] Oops: 0002 [#1] SMP
[ 752.613342] CPU 0
[ 752.615175] Modules linked in:
[ 752.618428]
[ 752.619921] Pid: 9187, comm: sas2flash Not tainted 3.2.0-rc1-tip-yh-01580-g878f195-dirty #1288 Oracle Corporation Sun Blade
[ 752.632632] RIP: 0010:[<ffffffff8160b5f3>] [<ffffffff8160b5f3>] mpt2sas_scsih_reset_handler+0x168/0x183

it turns out it is introduced in

_scsih_error_recovery_delete_devices() forget to alloc the event before using.

It is introduced by:

| commit 921cd8024b908f8f49f772c8d3a02381b4db2ed2
| Author: nagalakshmi.nandigama@lsi.com <nagalakshmi.nandigama@lsi.com>
| Date: Wed Oct 19 15:36:26 2011 +0530
|
| [SCSI] mpt2sas: New feature - Fast Load Support

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
drivers/scsi/mpt2sas/mpt2sas_scsih.c | 3 +++
1 file changed, 3 insertions(+)

Index: linux-2.6/drivers/scsi/mpt2sas/mpt2sas_scsih.c
===================================================================
--- linux-2.6.orig/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ linux-2.6/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -2802,6 +2802,9 @@ _scsih_error_recovery_delete_devices(str

if (ioc->is_driver_loading)
return;
+ fw_event = kzalloc(sizeof(struct fw_event_work), GFP_ATOMIC);
+ if (!fw_event)
+ return;
fw_event->event = MPT2SAS_REMOVE_UNRESPONDING_DEVICES;
fw_event->ioc = ioc;
_scsih_fw_event_add(ioc, fw_event);

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