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scsi: core: Make scsi_internal_device_unblock_nowait() reject invalid new_state

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The only 'new_state' values passed by upstream kernel code to
scsi_internal_device_unblock_nowait() are SDEV_RUNNING and
SDEV_TRANSPORT_OFFLINE. These are the only values that should be passed to
this function. Hence check the value of the 'new_state' argument to avoid
that scsi_internal_device_unblock_nowait() would be used to trigger an
illegal SCSI device state transition. In this context 'illegal' means not
allowed by scsi_device_set_state().

Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2019-08-01 15:38:12 -07:00 committed by Martin K. Petersen
parent 4b828fe156
commit 09addb1d16
1 changed files with 8 additions and 0 deletions
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8
drivers/scsi/scsi_lib.c
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@ -2707,6 +2707,14 @@ void scsi_start_queue(struct scsi_device *sdev)
int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
enum scsi_device_state new_state)
{
switch (new_state) {
case SDEV_RUNNING:
case SDEV_TRANSPORT_OFFLINE:
break;
default:
return -EINVAL;
}
/*
* Try to transition the scsi device to SDEV_RUNNING or one of the
* offlined states and goose the device queue if successful.