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Re: [PATCH v2] Fix NULL pointer dereference in bl_free_device().

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On Tue, Jul 19, 2016 at 05:39:04PM +0200, Artem Savkov wrote:
> When bl_parse_deviceid() fails in bl_alloc_deviceid_node() on
> blkdev_get_by_*() step we get an pnfs_block_dev struct that is
> uninitialized except for bdev field which is set to whatever error
> blkdev_get_by_*() returns.  bl_free_device() then tries to call
> blkdev_put() if bdev is not 0 resulting in a wrong pointer dereference.
> 
> Fixing this by making sure bdev is not an error code in bl_free_device().
> 
> Signed-off-by: Artem Savkov <asavkov@redhat.com>

I guess this is fine to be defensive, but we should probably just ensure
->bdev is NULLed on failure.

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Thread

[PATCH] Fix NULL pointer dereference in bl_free_device(). Artem Savkov <asavkov@redhat.com> - 2016-07-19 13:40 +0200
  Re: [PATCH] Fix NULL pointer dereference in bl_free_device(). Anna Schumaker <Anna.Schumaker@netapp.com> - 2016-07-19 17:30 +0200
    [PATCH v2] Fix NULL pointer dereference in bl_free_device(). Artem Savkov <asavkov@redhat.com> - 2016-07-19 17:50 +0200
      Re: [PATCH v2] Fix NULL pointer dereference in bl_free_device(). Christoph Hellwig <hch@lst.de> - 2016-07-21 10:10 +0200
        [PATCH v3] Fix NULL pointer dereference in bl_free_device(). Artem Savkov <asavkov@redhat.com> - 2016-07-21 13:40 +0200
          Re: [PATCH v3] Fix NULL pointer dereference in bl_free_device(). "Benjamin Coddington" <bcodding@redhat.com> - 2016-07-21 14:30 +0200
  Re: [PATCH] Fix NULL pointer dereference in bl_free_device(). Anna Schumaker <Anna.Schumaker@netapp.com> - 2016-07-19 17:30 +0200

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