From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 23 Mar 2014 04:28:40 +0000 (-0400)
Subject: make prepend_name() work correctly when called with negative *buflen
X-Git-Tag: v3.14~19^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e825196d48d2b89a6ec3a8eff280098d2a78207e;p=pandora-kernel.git

make prepend_name() work correctly when called with negative *buflen

In all callchains leading to prepend_name(), the value left in *buflen
is eventually discarded unused if prepend_name() has returned a negative.
So we are free to do what prepend() does, and subtract from *buflen
*before* checking for underflow (which turns into checking the sign
of subtraction result, of course).

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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