Commit 4aa6e6a0 authored by Yann Droneaud's avatar Yann Droneaud Committed by Luis Henriques

IB/core: disallow registering 0-sized memory region

commit 8abaae62 upstream.

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: Shachar Raindel <raindel@mellanox.com>
Cc: Jack Morgenstein <jackm@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: default avatarYann Droneaud <ydroneaud@opteya.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent ea08dc51
......@@ -94,6 +94,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
if (dmasync)
dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs);
if (!size)
return ERR_PTR(-EINVAL);
/*
* If the combination of the addr and size requested for this memory
* region causes an integer overflow, return error.
......
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