From: Oleg Drokin <green@linuxhacker.ru>
Date: Mon, 23 Jun 2014 01:32:06 +0000 (-0400)
Subject: staging/lustre/ptlrpc: Protect request buffer changing
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~166^2~1361
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=61d7258bf144ff388f51d0a3b295a7493fe10035;p=pandora-kernel.git

staging/lustre/ptlrpc: Protect request buffer changing

*_enlarge_reqbuf class of functions can change request body location
for a request that's already in replay list, as such a parallel
traverser of the list (after_reply -> ptlrpc_free_committed) might
access freed and scrambled memory causing assertion.

Since all such users only can get to this request under imp_lock, take
imp_lock to protect against them in *_enlarge_reqbuf

Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/10074
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3333
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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