From e56108d65f8705170d238858616728359542aebb Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 11 Oct 2012 14:24:13 +1100 Subject: [PATCH] md/raid5: be careful not to resize_stripes too big. When a RAID5 is reshaping, conf->raid_disks is increased before mddev->delta_disks becomes zero. This can result in check_reshape calling resize_stripes with a number that is too large. This particularly happens when md_check_recovery calls ->check_reshape(). If we use ->previous_raid_disks, we don't risk this. Signed-off-by: NeilBrown --- drivers/md/raid5.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 4cc6b0e398bc..2737247d2a02 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -5871,7 +5871,8 @@ static int check_reshape(struct mddev *mddev) if (!check_stripe_cache(mddev)) return -ENOSPC; - return resize_stripes(conf, conf->raid_disks + mddev->delta_disks); + return resize_stripes(conf, (conf->previous_raid_disks + + mddev->delta_disks)); } static int raid5_start_reshape(struct mddev *mddev) -- GitLab