From: Sage Weil <sage@inktank.com>
Date: Mon, 30 Jul 2012 23:20:25 +0000 (-0700)
Subject: libceph: (re)initialize bio_iter on start of message receive
X-Git-Tag: v3.6-rc1~36^2~52
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a4107026976f06c9a6ce8cc84a763564ee39d901;p=pandora-kernel.git

libceph: (re)initialize bio_iter on start of message receive

Previously, we were opportunistically initializing the bio_iter if it
appeared to be uninitialized in the middle of the read path.  The problem
is that a sequence like:

 - start reading message
 - initialize bio_iter
 - read half a message
 - messenger fault, reconnect
 - restart reading message
 - ** bio_iter now non-NULL, not reinitialized **
 - read past end of bio, crash

Instead, initialize the bio_iter unconditionally when we allocate/claim
the message for read.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
---

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