[PATCH] scsi: smartpqi: Handle pqi_alloc_io_request() failure

[Triet Hoang]

Check the return value of pqi_alloc_io_request() before dereferencing
the returned request in pqi_submit_raid_request_synchronous() and
pqi_lun_reset().

Return SCSI_MLQUEUE_HOST_BUSY when a request cannot be allocated so that
the operation can be retried instead of dereferencing a NULL pointer.

Signed-off-by: Triet Hoang <triet.hoang.dev@xxxxxxxxx>
---
 drivers/scsi/smartpqi/smartpqi_init.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 5ec583dc2e7d..0930decef404 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -4667,6 +4667,10 @@ static int pqi_submit_raid_request_synchronous(struct pqi_ctrl_info *ctrl_info,
 	}
 
 	io_request = pqi_alloc_io_request(ctrl_info, NULL);
+	if (!io_request) {
+		rc = SCSI_MLQUEUE_HOST_BUSY;
+		goto out;
+	}
 
 	put_unaligned_le16(io_request->index,
 		&(((struct pqi_raid_path_request *)request)->request_id));
@@ -6353,6 +6357,9 @@ static int pqi_lun_reset(struct pqi_ctrl_info *ctrl_info, struct pqi_scsi_dev *d
 	struct pqi_task_management_request *request;
 
 	io_request = pqi_alloc_io_request(ctrl_info, NULL);
+	if (!io_request)
+		return SCSI_MLQUEUE_HOST_BUSY;
+
 	io_request->io_complete_callback = pqi_lun_reset_complete;
 	io_request->context = &wait;
 
-- 
2.53.0