[PATCH 6/6] mpi3mr: Bad drive in topology results kernel crash

[Ranjan Kumar <ranjan.kumar@broadcom.com>]

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When the SAS Transport Layer support is enabled and when a device
exposed to the OS by the driver failed Inquiry commands then the
driver frees up the memory allocated for an internal HBA port
data structure. However, in some places, the reference to the
freed memory is not cleared.When the firmware sends the Device Info
change event for the same device again,then the freed memory is
accessed and that leads to memory corruption and OS crash.

Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
---
 drivers/scsi/mpi3mr/mpi3mr_transport.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/mpi3mr/mpi3mr_transport.c b/drivers/scsi/mpi3mr/mpi3mr_transport.c
index 584daf8a3ac9..1869e45e04d4 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_transport.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_transport.c
@@ -2358,15 +2358,16 @@ int mpi3mr_report_tgtdev_to_sas_transport(struct mpi3mr_ioc *mrioc,
 	tgtdev->host_exposed = 1;
 	if (!mpi3mr_sas_port_add(mrioc, tgtdev->dev_handle,
 	    sas_address_parent, hba_port)) {
-		tgtdev->host_exposed = 0;
 		retval = -1;
-	} else if ((!tgtdev->starget)) {
-		if (!mrioc->is_driver_loading)
+		} else if ((!tgtdev->starget) && (!mrioc->is_driver_loading)) {
 			mpi3mr_sas_port_remove(mrioc, sas_address,
 			    sas_address_parent, hba_port);
-		tgtdev->host_exposed = 0;
 		retval = -1;
 	}
+	if (retval) {
+		tgtdev->dev_spec.sas_sata_inf.hba_port = NULL;
+		tgtdev->host_exposed = 0;
+	}
 	return retval;
 }
 
@@ -2395,6 +2396,7 @@ void mpi3mr_remove_tgtdev_from_sas_transport(struct mpi3mr_ioc *mrioc,
 	mpi3mr_sas_port_remove(mrioc, sas_address, sas_address_parent,
 	    hba_port);
 	tgtdev->host_exposed = 0;
+	tgtdev->dev_spec.sas_sata_inf.hba_port = NULL;
 }
 
 /**
@@ -2451,7 +2453,7 @@ static u8 mpi3mr_get_port_id_by_rphy(struct mpi3mr_ioc *mrioc, struct sas_rphy *
 
 		tgtdev = __mpi3mr_get_tgtdev_by_addr_and_rphy(mrioc,
 			    rphy->identify.sas_address, rphy);
-		if (tgtdev) {
+		if (tgtdev && tgtdev->dev_spec.sas_sata_inf.hba_port) {
 			port_id =
 				tgtdev->dev_spec.sas_sata_inf.hba_port->port_id;
 			mpi3mr_tgtdev_put(tgtdev);
-- 
2.31.1


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