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authorJunichi Nomura <j-nomura@ce.jp.nec.com>2015-10-06 04:32:57 +0000
committerJames Bottomley <JBottomley@Odin.com>2015-10-27 11:22:37 +0900
commit23695e41a1cac017edad2b38607f33678a31b877 (patch)
tree2cadb3d6276f29f8a3555b8601d91c4aaa15d50e /drivers/scsi/scsi_dh.c
parent2280521719e81919283b82902ac24058f87dfc1b (diff)
downloadlinux-23695e41a1cac017edad2b38607f33678a31b877.tar.bz2
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 <j-nomura@ce.jp.nec.com> Acked-by: Christoph Hellwig <hch@lst.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
Diffstat (limited to 'drivers/scsi/scsi_dh.c')
-rw-r--r--drivers/scsi/scsi_dh.c6
1 files changed, 5 insertions, 1 deletions
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);
}