linux-kernel - [PATCH 3.4 32/35] SCSI: storvsc: NULL pointer dereference fix

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Date:	Thu, 20 Mar 2014 17:11:23 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ales Novak <alnovak@...e.cz>,
	Thomas Abraham <tabraham@...e.com>,
	Jiri Kosina <jkosina@...e.cz>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [PATCH 3.4 32/35] SCSI: storvsc: NULL pointer dereference fix

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

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

From: Ales Novak <alnovak@...e.cz>

commit b12bb60d6c350b348a4e1460cd68f97ccae9822e upstream.

If the initialization of storvsc fails, the storvsc_device_destroy()
causes NULL pointer dereference.

storvsc_bus_scan()
  scsi_scan_target()
    __scsi_scan_target()
      scsi_probe_and_add_lun(hostdata=NULL)
        scsi_alloc_sdev(hostdata=NULL)

	  sdev->hostdata = hostdata

	  now the host allocation fails

          __scsi_remove_device(sdev)

	  calls sdev->host->hostt->slave_destroy() ==
	  storvsc_device_destroy(sdev)
	    access of sdev->hostdata->request_mempool

Signed-off-by: Ales Novak <alnovak@...e.cz>
Signed-off-by: Thomas Abraham <tabraham@...e.com>
Reviewed-by: Jiri Kosina <jkosina@...e.cz>
Acked-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/storvsc_drv.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1131,6 +1131,9 @@ static void storvsc_device_destroy(struc
 {
 	struct stor_mem_pools *memp = sdevice->hostdata;
 
+	if (!memp)
+		return;
+
 	mempool_destroy(memp->request_mempool);
 	kmem_cache_destroy(memp->request_pool);
 	kfree(memp);


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