From: Oleg Drokin <green@linuxhacker.ru>
Date: Thu, 11 Jun 2015 05:37:51 +0000 (-0400)
Subject: staging/lustre/llite: fix ll_getname user buffer copy
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~121^2~254
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a75034345b3026f1cf5668e70688ea53184e49c1;p=pandora-kernel.git

staging/lustre/llite: fix ll_getname user buffer copy

strncpy_from_user could return negative values on error,
so need to take those into account.
Since ll_getname is used to get a single component name from userspace
to transfer to server as-is, there's no need to allocate 4k buffer
as done by __getname. Allocate NAME_MAX+1 buffer instead to ensure
we have enough for a null terminated max valid length buffer.

This was discovered by Al Viro in https://lkml.org/lkml/2015/4/11/243

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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