From: Roland Dreier <rolandd@cisco.com>
Date: Thu, 17 Apr 2008 04:01:13 +0000 (-0700)
Subject: IB/mthca: Avoid integer overflow when allocating huge ICM table
X-Git-Tag: v2.6.26-rc1~1156^2~68
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c263ff65d5936113cfcbb8139d34122361e2306e;p=pandora-kernel.git

IB/mthca: Avoid integer overflow when allocating huge ICM table

In mthca_alloc_icm_table(), the number of entries to allocate for the
table->icm array is computed by calculating obj_size * nobj and then
dividing by MTHCA_TABLE_CHUNK_SIZE.  If nobj is really large, then
obj_size * nobj may overflow and the division may get the wrong value
(even a negative value).  Fix this by calculating the number of
objects per chunk and then dividing nobj by this value instead.

This patch allows crazy configurations such as loading ib_mthca with
the module parameter num_mtt=33554432 to work properly.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
---

Reading git-diff-tree failed