From: Yann Droneaud <ydroneaud@opteya.com>
Date: Wed, 11 Dec 2013 22:01:52 +0000 (+0100)
Subject: IB/uverbs: Check input length in flow steering uverbs
X-Git-Tag: v3.13-rc6~12^2^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6bcca3d4a3bcc9859cf001a0a21c8796edae2dc0;p=pandora-kernel.git

IB/uverbs: Check input length in flow steering uverbs

Since ib_copy_from_udata() doesn't check yet the available input data
length before accessing userspace memory, an explicit check of this
length is required to prevent:

- reading past the user provided buffer,
- underflow when subtracting the expected command size from the input
  length.

This will ensure the newly added flow steering uverbs don't try to
process truncated commands.

Link: http://marc.info/?i=cover.1386798254.git.ydroneaud@opteya.com>
Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
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