From 23695e41a1cac017edad2b38607f33678a31b877 Mon Sep 17 00:00:00 2001 From: Junichi Nomura Date: Tue, 6 Oct 2015 04:32:57 +0000 Subject: scsi_dh: fix use-after-free when removing scsi device The commit 1bab0de0274f ("dm-mpath, scsi_dh: don't let dm detach device handlers") removed reference counting of attached scsi device handler. As a result, handler data is freed immediately via scsi_dh->detach() in the context of scsi_remove_device() where activation request can be still in flight. This patch moves scsi_dh_handler_detach() to sdev releasing function, scsi_device_dev_release_usercontext(), at that point the device is already in quiesced state. Fixes: 1bab0de0274f ("dm-mpath, scsi_dh: don't let dm detach device handlers") Signed-off-by: Jun'ichi Nomura Acked-by: Christoph Hellwig Signed-off-by: James Bottomley --- drivers/scsi/scsi_dh.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/scsi/scsi_dh.c') diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c index 0a2168e69bbc..cb78388de3fc 100644 --- a/drivers/scsi/scsi_dh.c +++ b/drivers/scsi/scsi_dh.c @@ -232,10 +232,14 @@ int scsi_dh_add_device(struct scsi_device *sdev) return err; } -void scsi_dh_remove_device(struct scsi_device *sdev) +void scsi_dh_release_device(struct scsi_device *sdev) { if (sdev->handler) scsi_dh_handler_detach(sdev); +} + +void scsi_dh_remove_device(struct scsi_device *sdev) +{ device_remove_file(&sdev->sdev_gendev, &scsi_dh_state_attr); } -- cgit v1.2.3