From: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Date: Tue, 30 Dec 2014 00:48:09 +0000 (+0200)
Subject: 9p: use unsigned integers for nwqid/count
X-Git-Tag: omap-for-v4.2/o2_dc~84^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6250a8badb311953a49bedb16ed17eb59d21c03a;p=pandora-kernel.git

9p: use unsigned integers for nwqid/count

As specification says, all integers in messages are unsigned. Let's fix
behaviour of p9pdu_vreadf()/p9pdu_vwritef() accordingly.

Fix for p9pdu_vreadf() is critical. If server replies with Rwalk, where
nwqid > SHRT_MAX, the value will be interpreted as negative. kmalloc, in
its order, will cast the value to (very big) size_t.

It should never happen in normal situation: we never submit Twalk with
nwname > 16, but malicious or broken server can still produce
problematic Rwalk.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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