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| author | Bart Van Assche <bart.vanassche@wdc.com> | 2017-10-27 08:23:21 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-10-27 08:23:21 -0600 |
| commit | efea2abcb03215f2efadfe994ff7f652aaff196b (patch) | |
| tree | 5c16510723274dfea91e4f0e9d4100a62e41b360 | |
| parent | 93689a603141ca9237203cebfa6b45775caccdb5 (diff) | |
| download | linux-stable-efea2abcb03215f2efadfe994ff7f652aaff196b.tar.gz linux-stable-efea2abcb03215f2efadfe994ff7f652aaff196b.tar.bz2 linux-stable-efea2abcb03215f2efadfe994ff7f652aaff196b.zip | |
virtio_blk: Fix an SG_IO regression
Avoid that submitting an SG_IO ioctl triggers a kernel oops that
is preceded by:
usercopy: kernel memory overwrite attempt detected to (null) (<null>) (6 bytes)
kernel BUG at mm/usercopy.c:72!
Reported-by: Dann Frazier <dann.frazier@canonical.com>
Fixes: commit ca18d6f769d2 ("block: Make most scsi_req_init() calls implicit")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Dann Frazier <dann.frazier@canonical.com>
Cc: <stable@vger.kernel.org> # v4.13
Reviewed-by: Christoph Hellwig <hch@lst.de>
Moved virtblk_initialize_rq() inside CONFIG_VIRTIO_BLK_SCSI.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/block/virtio_blk.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 34e17ee799be..68846897d213 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -593,10 +593,22 @@ static int virtblk_map_queues(struct blk_mq_tag_set *set) return blk_mq_virtio_map_queues(set, vblk->vdev, 0); } +#ifdef CONFIG_VIRTIO_BLK_SCSI +static void virtblk_initialize_rq(struct request *req) +{ + struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); + + scsi_req_init(&vbr->sreq); +} +#endif + static const struct blk_mq_ops virtio_mq_ops = { .queue_rq = virtio_queue_rq, .complete = virtblk_request_done, .init_request = virtblk_init_request, +#ifdef CONFIG_VIRTIO_BLK_SCSI + .initialize_rq_fn = virtblk_initialize_rq, +#endif .map_queues = virtblk_map_queues, }; |