From 485f16b743d98527620396639b73d7214006f3c7 Mon Sep 17 00:00:00 2001
From: Shachar Raindel <raindel@mellanox.com>
Date: Wed, 18 Mar 2015 17:39:08 +0000
Subject: [PATCH] IB/uverbs: Prevent integer overflow in ib_umem_get address
 arithmetic

commit 8494057ab5e40df590ef6ef7d66324d3ae33356b upstream.

Properly verify that the resulting page aligned end address is larger
than both the start address and the length of the memory area requested.

Both the start and length arguments for ib_umem_get are controlled by
the user. A misbehaving user can provide values which will cause an
integer overflow when calculating the page aligned end address.

This overflow can cause also miscalculation of the number of pages
mapped, and additional logic issues.

Addresses: CVE-2014-8159
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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