linux-kernel - [PATCH] scsi: qla2xxx: Fix memory leak in qla2x00_probe

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Date:   Sat, 25 Mar 2023 11:00:04 +0000
From:   Li Zetao <lizetao1@...wei.com>
To:     <njavali@...vell.com>, <GR-QLogic-Storage-Upstream@...vell.com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <himanshu.madhani@...ium.com>, <quinn.tran@...ium.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] scsi: qla2xxx: Fix memory leak in qla2x00_probe_one()

There is a memory leak reported by kmemleak:

  unreferenced object 0xffffc900003f0000 (size 12288):
    comm "modprobe", pid 19117, jiffies 4299751452 (age 42490.264s)
    hex dump (first 32 bytes):
      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    backtrace:
      [<00000000629261a8>] __vmalloc_node_range+0xe56/0x1110
      [<0000000001906886>] __vmalloc_node+0xbd/0x150
      [<000000005bb4dc34>] vmalloc+0x25/0x30
      [<00000000a2dc1194>] qla2x00_create_host+0x7a0/0xe30 [qla2xxx]
      [<0000000062b14b47>] qla2x00_probe_one+0x2eb8/0xd160 [qla2xxx]
      [<00000000641ccc04>] local_pci_probe+0xeb/0x1a0

The root cause is traced to an error handling path in qla2x00_probe_one()
when the adapter "base_vha" initialize failed. The fab_scan_rp "scan.l"
is used to record the port information and it is alloced in
qla2x00_create_host(). However, it is not released in the error handling
path "probe_failed".

Fix it by freeing the memory of "scan.l" when an error occurs in adapter
initialize process.

Fixes: a4239945b8ad ("scsi: qla2xxx: Add switch command to simplify fabric discovery")
Signed-off-by: Li Zetao <lizetao1@...wei.com>
---
 drivers/scsi/qla2xxx/qla_os.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 80c4ee9df2a4..38916e11684d 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -3606,6 +3606,7 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 probe_failed:
 	qla_enode_stop(base_vha);
 	qla_edb_stop(base_vha);
+	vfree(base_vha->scan.l);
 	if (base_vha->gnl.l) {
 		dma_free_coherent(&ha->pdev->dev, base_vha->gnl.size,
 				base_vha->gnl.l, base_vha->gnl.ldma);
-- 
2.34.1