tree 37c3863b79be45c0d47f57aa72709ea3b9db64e9
parent d1398a6ff503a849f3c123bc5f0fdff383a1b6ec
author Michael S. Tsirkin <mst@mellanox.co.il> 1167828390 +0200
committer Roland Dreier <rolandd@cisco.com> 1167968792 -0800

IB/mthca: Fix off-by-one in FMR handling on memfree

mthca_table_find() will return the wrong address when the table entry
being searched for is exactly at the beginning of a sglist entry
(other than the first), because it uses >= when it should use >.

Example: assume we have 2 entries in scatterlist, 4K each, offset is
4K.  The current code will return first entry + 4K when we really want
the second entry.

In particular this means mapping an FMR on a memfree HCA may end up
writing the page table into the wrong place, leading to memory
corruption and also causing the HCA to use an incorrect address
translation table.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>