From: Alex Elder <elder@inktank.com>
Date: Wed, 10 Apr 2013 22:47:46 +0000 (-0500)
Subject: rbd: do a safe list traversal in rbd_img_request_submit()
X-Git-Tag: v3.9-rc8~18^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=46faeed4a61e220b99591e9773057160eb437cc8;p=pandora-kernel.git

rbd: do a safe list traversal in rbd_img_request_submit()

It's possible that the reference to the object request dropped
inside the loop in rbd_img_request_submit() will be the last
one, in which case the content of the object pointer can't be
trusted.

Use a safe form of the object request list traversal to avoid
problems.

This resolves:
    http://tracker.ceph.com/issues/4705

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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