From: Kashyap, Desai <kashyap.desai@lsi.com>
Date: Mon, 5 Apr 2010 08:51:07 +0000 (+0530)
Subject: [SCSI] mpt2sas: Check for NULL pointer before free_pages is added.
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=66a679365780a8d775b1ed03e2576007f7100121;p=deliverable%2Flinux.git

[SCSI] mpt2sas: Check for NULL pointer before free_pages is added.

Added check before free_pages just to make sure ioc->scsi_lookup is not NULL.

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
---

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index b04ccad7d972..b830d61684dd 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -1919,7 +1919,10 @@ _base_release_memory_pools(struct MPT2SAS_ADAPTER *ioc)
 		    ioc->config_page, ioc->config_page_dma);
 	}
 
-	free_pages((ulong)ioc->scsi_lookup, ioc->scsi_lookup_pages);
+	if (ioc->scsi_lookup) {
+		free_pages((ulong)ioc->scsi_lookup, ioc->scsi_lookup_pages);
+		ioc->scsi_lookup = NULL;
+	}
 	kfree(ioc->hpr_lookup);
 	kfree(ioc->internal_lookup);
 }