md: linear: Fix a division by zero bug for very small arrays.

commit f1cd14ae52985634d0389e934eba25b5ecf24565 upstream

Date: Thu, 6 Nov 2008 19:41:24 +1100
Subject: md: linear: Fix a division by zero bug for very small arrays.

We currently oops with a divide error on starting a linear software
raid array consisting of at least two very small (< 500K) devices.

The bug is caused by the calculation of the hash table size which
tries to compute sector_div(sz, base) with "base" being zero due to
the small size of the component devices of the array.

Fix this by requiring the hash spacing to be at least one which
implies that also "base" is non-zero.

This bug has existed since about 2.6.14.

Signed-off-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index b1eebf8..a58a19e 100644 (file)
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -157,6 +157,8 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
 
        min_spacing = conf->array_sectors / 2;
        sector_div(min_spacing, PAGE_SIZE/sizeof(struct dev_info *));
+       if (min_spacing == 0)
+               min_spacing = 1;
 
        /* min_spacing is the minimum spacing that will fit the hash
         * table in one PAGE.  This may be much smaller than needed.