From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Sat, 4 Sep 2010 23:13:24 +0000 (+0200)
Subject: drbd: fix potential kernel BUG (NULL deref)
X-Git-Tag: v2.6.37-rc1~167^2~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1d53f09e170e477de67babd7a10e277479260d51;p=pandora-kernel.git

drbd: fix potential kernel BUG (NULL deref)

BUG trace would look like:
 lc_find
 drbd_rs_complete_io
 got_OVResult
 drbd_asender

Could be triggered by explicit, or IO-error policy based,
detach during online-verify.

We may only dereference mdev->resync, if we first get_ldev(), as the
disk may break any time, causing mdev->resync to disappear once all
ldev references have been returned.
Already in flight online-verify requests or replies may still come in,
which we then need to ignore.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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