[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>

1 files changed, 4 insertions, 1 deletions

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);
 }