diff options
| author | Rafael Mendonca <rafaelmendsr@gmail.com> | 2022-10-21 17:41:26 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-12 12:02:54 +0100 |
| commit | bff553de2c372ef088666d89465cc60a3e2ef12d (patch) | |
| tree | c9383eb8a6a009be1d0c3c0ce838764f4fcf9175 /drivers/block | |
| parent | 569b4f8fb02e212353fbe7ae3d4dacd3016217d0 (diff) | |
| download | linux-bff553de2c372ef088666d89465cc60a3e2ef12d.tar.gz | |
virtio_blk: Fix signedness bug in virtblk_prep_rq()
[ Upstream commit a26116c1e74028914f281851488546c91cbae57d ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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 3efe3da5f8c2..a7697027ce43 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); |