From 0544a21db02c1d8883158fd6f323364f830a120a Mon Sep 17 00:00:00 2001
From: "Prasanna S. Panchamukhi" <prasanna.panchamukhi@riverbed.com>
Date: Thu, 24 Jun 2010 13:31:03 +1000
Subject: [PATCH] md: raid10: Fix null pointer dereference in fix_read_error()

Such NULL pointer dereference can occur when the driver was fixing the
read errors/bad blocks and the disk was physically removed
causing a system crash. This patch check if the
rcu_dereference() returns valid rdev before accessing it in fix_read_error().

Cc: stable@kernel.org
Signed-off-by: Prasanna S. Panchamukhi <prasanna.panchamukhi@riverbed.com>
Signed-off-by: Rob Becker <rbecker@riverbed.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---
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