Patch "dm raid: fix panic when attempting to force a raid to sync" has been added to the 4.14-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    dm raid: fix panic when attempting to force a raid to sync

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     dm-raid-fix-panic-when-attempting-to-force-a-raid-to-sync.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Tue Dec 12 10:32:42 CET 2017
From: Heinz Mauelshagen <heinzm@redhat.com>
Date: Thu, 2 Nov 2017 19:58:28 +0100
Subject: dm raid: fix panic when attempting to force a raid to sync

From: Heinz Mauelshagen <heinzm@redhat.com>


[ Upstream commit 233978449074ca7e45d9c959f9ec612d1b852893 ]

Requesting a sync on an active raid device via a table reload
(see 'sync' parameter in Documentation/device-mapper/dm-raid.txt)
skips the super_load() call that defines the superblock size
(rdev->sb_size) -- resulting in an oops if/when super_sync()->memset()
is called.

Fix by moving the initialization of the superblock start and size
out of super_load() to the caller (analyse_superblocks).

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/md/dm-raid.c |   21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -2143,13 +2143,6 @@ static int super_load(struct md_rdev *rd
 	struct dm_raid_superblock *refsb;
 	uint64_t events_sb, events_refsb;
 
-	rdev->sb_start = 0;
-	rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
-	if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) {
-		DMERR("superblock size of a logical block is no longer valid");
-		return -EINVAL;
-	}
-
 	r = read_disk_sb(rdev, rdev->sb_size, false);
 	if (r)
 		return r;
@@ -2494,6 +2487,17 @@ static int analyse_superblocks(struct dm
 		if (test_bit(Journal, &rdev->flags))
 			continue;
 
+		if (!rdev->meta_bdev)
+			continue;
+
+		/* Set superblock offset/size for metadata device. */
+		rdev->sb_start = 0;
+		rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
+		if (rdev->sb_size < sizeof(struct dm_raid_superblock) || rdev->sb_size > PAGE_SIZE) {
+			DMERR("superblock size of a logical block is no longer valid");
+			return -EINVAL;
+		}
+
 		/*
 		 * Skipping super_load due to CTR_FLAG_SYNC will cause
 		 * the array to undergo initialization again as
@@ -2506,9 +2510,6 @@ static int analyse_superblocks(struct dm
 		if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
 			continue;
 
-		if (!rdev->meta_bdev)
-			continue;
-
 		r = super_load(rdev, freshest);
 
 		switch (r) {


Patches currently in stable-queue which might be from heinzm@redhat.com are

queue-4.14/dm-raid-fix-panic-when-attempting-to-force-a-raid-to-sync.patch