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[SCSI] storvsc: NULL pointer dereference fix

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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@suse.cz>
Signed-off-by: Thomas Abraham <tabraham@suse.com>
Reviewed-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: stable@vger.kernel.org
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Ales Novak 2014-02-27 11:03:30 +01:00 committed by James Bottomley
parent b77ed25c9f
commit b12bb60d6c
1 changed files with 3 additions and 0 deletions
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3
drivers/scsi/storvsc_drv.c
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@ -1419,6 +1419,9 @@ static void storvsc_device_destroy(struct scsi_device *sdevice)
{
struct stor_mem_pools *memp = sdevice->hostdata;
if (!memp)
return;
mempool_destroy(memp->request_mempool);
kmem_cache_destroy(memp->request_pool);
kfree(memp);