linux-kernel - [PATCH 01/10] drbd: Fix potenial risk of overlap the old history when move history.

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Message-Id: <1433922509-10280-2-git-send-email-nwang@suse.com>
Date:	Wed, 10 Jun 2015 15:48:20 +0800
From:	Nick Wang <nwang@...e.com>
To:	philipp.reisner@...bit.com, lars.ellenberg@...bit.com,
	drbd-dev@...ts.linbit.com
Cc:	linux-kernel@...r.kernel.org, nwang@...e.com
Subject: [PATCH 01/10] drbd: Fix potenial risk of overlap the old history when move history.

Fix the potential history overlap when using more than two history uuids.

Signed-off-by: Nick Wang <nwang@...e.com>
CC: Philipp Reisner <philipp.reisner@...bit.com>
CC: Lars Ellenberg <lars.ellenberg@...bit.com>
CC: drbd-dev@...ts.linbit.com
CC: linux-kernel@...r.kernel.org

---
 drbd/drbd_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drbd/drbd_main.c b/drbd/drbd_main.c
index f41aa8a..2ffb569 100644
--- a/drbd/drbd_main.c
+++ b/drbd/drbd_main.c
@@ -3466,8 +3466,8 @@ void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local)
 {
 	int i;
 
-	for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++)
-		device->ldev->md.uuid[i+1] = device->ldev->md.uuid[i];
+	for (i = UI_HISTORY_END; i > UI_HISTORY_START; i--)
+		device->ldev->md.uuid[i] = device->ldev->md.uuid[i-1];
 }
 
 void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local)
-- 
1.8.4.5

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