From: Roland Dreier <rolandd@cisco.com>
Date: Fri, 18 Nov 2005 22:18:26 +0000 (-0800)
Subject: IB/umad: make sure write()s have sufficient data
X-Git-Tag: v2.6.15-rc2~15^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eabc77935d8d2a761c88b9cbb6313bd54b6ddbb3;p=pandora-kernel.git

IB/umad: make sure write()s have sufficient data

Make sure that userspace passes in enough data when sending a MAD.  We
always copy at least sizeof (struct ib_user_mad) + IB_MGMT_RMPP_HDR
bytes from userspace, so anything less is definitely invalid.  Also,
if the length is less than this limit, it's possible for the second
copy_from_user() to get a negative length and trigger a BUG().

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