diff options
| author | Rafael Mendonca <rafaelmendsr@gmail.com> | 2022-10-21 22:41:26 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-12-28 11:28:11 +0100 |
| commit | a26116c1e74028914f281851488546c91cbae57d (patch) | |
| tree | b1fba6dabe7af5a7e42add322392e4387507d4ad /drivers/block | |
| parent | vdpa_sim_net: should not drop the multicast/broadcast packet (diff) | |
| download | linux-a26116c1e74028914f281851488546c91cbae57d.tar.xz linux-a26116c1e74028914f281851488546c91cbae57d.zip | |
virtio_blk: Fix signedness bug in virtblk_prep_rq()
The virtblk_map_data() function returns negative error codes, however, the
'nents' field of vbr->sg_table is an unsigned int, which causes the error
handling not to work correctly.
Cc: stable@vger.kernel.org
Fixes: 0e9911fa768f ("virtio-blk: support mq_ops->queue_rqs()")
Signed-off-by: Rafael Mendonca <rafaelmendsr@gmail.com>
Message-Id: <20221021204126.927603-1-rafaelmendsr@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Suwan Kim <suwan.kim027@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/virtio_blk.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index dcbf86cd2155..6a77fa917428 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -334,14 +334,16 @@ static blk_status_t virtblk_prep_rq(struct blk_mq_hw_ctx *hctx, struct virtblk_req *vbr) { blk_status_t status; + int num; status = virtblk_setup_cmd(vblk->vdev, req, vbr); if (unlikely(status)) return status; - vbr->sg_table.nents = virtblk_map_data(hctx, req, vbr); - if (unlikely(vbr->sg_table.nents < 0)) + num = virtblk_map_data(hctx, req, vbr); + if (unlikely(num < 0)) return virtblk_fail_to_queue(req, -ENOMEM); + vbr->sg_table.nents = num; blk_mq_start_request(req); |