libata: add refcounting to ata_host
After commit 9a6d6a2d ("ata: make ata port as parent device of scsi host") manual driver unbind/remove causes use-after-free. Unbind unconditionally invokes devres_release_all() which calls ata_host_release() and frees ata_host/ata_port memory while it is still being referenced as a parent of SCSI host. When SCSI host is finally released scsi_host_dev_release() calls put_device(parent) and accesses freed ata_port memory. Add reference counting to make sure that ata_host lives long enough. Bug report: https://lkml.org/lkml/2017/11/1/945 Fixes: 9a6d6a2d ("ata: make ata port as parent device of scsi host") Cc: Tejun Heo <tj@kernel.org> Cc: Lin Ming <minggr@gmail.com> Cc: linux-ide@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by:Taras Kondratiuk <takondra@cisco.com> Signed-off-by:
Tejun Heo <tj@kernel.org>
parent
a80ea4cb
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