linux-kernel - [PATCH AUTOSEL 4.18 039/100] scsi: qedi: Initialize the stats mutex lock

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Message-Id: <20181016041221.135528-39-sashal@kernel.org>
Date:   Tue, 16 Oct 2018 00:11:20 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Nilesh Javali <nilesh.javali@...ium.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.18 039/100] scsi: qedi: Initialize the stats mutex lock

From: Nilesh Javali <nilesh.javali@...ium.com>

[ Upstream commit 3cc5746e5ad7688e274e193fa71278d98aa52759 ]

Fix kernel NULL pointer dereference,

Call Trace:
  [<ffffffff9b7658e6>] __mutex_lock_slowpath+0xa6/0x1d0
  [<ffffffff9b764cef>] mutex_lock+0x1f/0x2f
  [<ffffffffc061b5e1>] qedi_get_protocol_tlv_data+0x61/0x450 [qedi]
  [<ffffffff9b1f9d8e>] ? map_vm_area+0x2e/0x40
  [<ffffffff9b1fc370>] ? __vmalloc_node_range+0x170/0x280
  [<ffffffffc0b81c3d>] ? qed_mfw_process_tlv_req+0x27d/0xbd0 [qed]
  [<ffffffffc0b6461b>] qed_mfw_fill_tlv_data+0x4b/0xb0 [qed]
  [<ffffffffc0b81c59>] qed_mfw_process_tlv_req+0x299/0xbd0 [qed]
  [<ffffffff9b02a59e>] ? __switch_to+0xce/0x580
  [<ffffffffc0b61e5b>] qed_slowpath_task+0x5b/0x80 [qed]

Signed-off-by: Nilesh Javali <nilesh.javali@...ium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/qedi/qedi_main.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c
index 3e18a68c2b03..054e66d93ed6 100644
--- a/drivers/scsi/qedi/qedi_main.c
+++ b/drivers/scsi/qedi/qedi_main.c
@@ -2472,6 +2472,7 @@ static int __qedi_probe(struct pci_dev *pdev, int mode)
 		/* start qedi context */
 		spin_lock_init(&qedi->hba_lock);
 		spin_lock_init(&qedi->task_idx_lock);
+		mutex_init(&qedi->stats_lock);
 	}
 	qedi_ops->ll2->register_cb_ops(qedi->cdev, &qedi_ll2_cb_ops, qedi);
 	qedi_ops->ll2->start(qedi->cdev, &params);
-- 
2.17.1