From 36707bb2e7c6730d79d6cdc6d1475d3d7e94c518 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.com>
Date: Thu, 24 Sep 2015 15:25:36 +1000
Subject: [PATCH] md/raid5: don't index beyond end of array in
 need_this_block().

When need_this_block probably shouldn't be called when there
are more than 2 failed devices, we really don't want it to try
indexing beyond the end of the failed_num[] of fdev[] arrays.

So limit the loops to at most 2 iterations.

Reported-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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