linux-kernel - [PATCH 3.16 032/127] qla2xxx: Fix shost use-after-free on device removal

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Message-Id: <20141028033422.331267952@linuxfoundation.org>
Date:	Tue, 28 Oct 2014 11:34:27 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Joe Lawrence <joe.lawrence@...atus.com>,
	Chad Dupuis <chad.dupuis@...gic.com>,
	Christoph Hellwig <hch@....de>
Subject: [PATCH 3.16 032/127] qla2xxx: Fix shost use-after-free on device removal

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joe Lawrence <joe.lawrence@...atus.com>

commit db7157d4cfce6edf052452fb1d327d4d11b67f4c upstream.

Once calling scsi_host_put, be careful to not access qla_hw_data through
the Scsi_Host private data (ie, scsi_qla_host base_vha).

Fixes: fe1b806f4f71 ("qla2xxx: Refactor shutdown code so some functionality can be reused")
Signed-off-by: Joe Lawrence <joe.lawrence@...atus.com>
Acked-by: Chad Dupuis <chad.dupuis@...gic.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/qla2xxx/qla_os.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -3111,10 +3111,8 @@ qla2x00_unmap_iobases(struct qla_hw_data
 }
 
 static void
-qla2x00_clear_drv_active(scsi_qla_host_t *vha)
+qla2x00_clear_drv_active(struct qla_hw_data *ha)
 {
-	struct qla_hw_data *ha = vha->hw;
-
 	if (IS_QLA8044(ha)) {
 		qla8044_idc_lock(ha);
 		qla8044_clear_drv_active(ha);
@@ -3185,7 +3183,7 @@ qla2x00_remove_one(struct pci_dev *pdev)
 
 	scsi_host_put(base_vha->host);
 
-	qla2x00_clear_drv_active(base_vha);
+	qla2x00_clear_drv_active(ha);
 
 	qla2x00_unmap_iobases(ha);
 


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