From 52c050236eaa4f0b5e1d160cd66dc18106445c4d Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 6 Apr 2011 20:28:34 +0200 Subject: [PATCH] virtio-blk: fail unaligned requests Like all block drivers virtio-blk should not allow small than block size granularity access. But given that the protocol specifies a byte unit length field we currently accept such requests, which cause qemu to abort() in lower layers. Add checks to the main read and write handlers to catch them early. Reported-by: Conor Murphy Tested-by: Conor Murphy Signed-off-by: Christoph Hellwig Reviewed-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- hw/virtio-blk.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c index b14fb995e8..91e0394af9 100644 --- a/hw/virtio-blk.c +++ b/hw/virtio-blk.c @@ -290,6 +290,10 @@ static void virtio_blk_handle_write(VirtIOBlockReq *req, MultiReqBuffer *mrb) virtio_blk_rw_complete(req, -EIO); return; } + if (req->qiov.size % req->dev->conf->logical_block_size) { + virtio_blk_rw_complete(req, -EIO); + return; + } if (mrb->num_writes == 32) { virtio_submit_multiwrite(req->dev->bs, mrb); @@ -317,6 +321,10 @@ static void virtio_blk_handle_read(VirtIOBlockReq *req) virtio_blk_rw_complete(req, -EIO); return; } + if (req->qiov.size % req->dev->conf->logical_block_size) { + virtio_blk_rw_complete(req, -EIO); + return; + } acb = bdrv_aio_readv(req->dev->bs, sector, &req->qiov, req->qiov.size / BDRV_SECTOR_SIZE,