From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Date: Mon, 20 May 2013 17:35:15 +0000 (+0530)
Subject: net/9p: Handle error in zero copy request correctly for 9p2000.u
X-Git-Tag: v3.10-rc6~29^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6390460af8a672754dd6743f326515e98f52b2a7;p=pandora-kernel.git

net/9p: Handle error in zero copy request correctly for 9p2000.u

For zero copy request, error will be encoded in the user space buffer.
So copy the error code correctly using copy_from_user. Here we use the
extra bytes we allocate for zero copy request. If total error details
are more than P9_ZC_HDR_SZ - 7 bytes, we return -EFAULT. The patch also
avoid a memory allocation in the error path.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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