tree 4f1f58fc9239da7f0f55706d252e31841e1fe393
parent 9b33410d3bdd40b6a289c6b79d40a96b129e22af
author Christoph Hellwig <hch@lst.de> 1302114514 +0200
committer Justin M. Forbes <jforbes@redhat.com> 1304429523 -0500

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 <conor_murphy_virt@hotmail.com>
Tested-by: Conor Murphy <conor_murphy_virt@hotmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>