tree a1d8a82a86b64c1f8b6823030c77242af4b790a3
parent c841e12add6926d64aa608687893465330b5a03e
author Yann Droneaud <ydroneaud@opteya.com> 1428929782 +0200
committer Doug Ledford <dledford@redhat.com> 1429128302 -0400

IB/core: disallow registering 0-sized memory region

If ib_umem_get() is called with a size equal to 0 and an
non-page aligned address, one page will be pinned and a
0-sized umem will be returned to the caller.

This should not be allowed: it's not expected for a memory
region to have a size equal to 0.

This patch adds a check to explicitly refuse to register
a 0-sized region.

Link: http://mid.gmane.org/cover.1428929103.git.ydroneaud@opteya.com
Cc: <stable@vger.kernel.org>
Cc: Shachar Raindel <raindel@mellanox.com>
Cc: Jack Morgenstein <jackm@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>