Patch "gfs2: Fixes to "Implement iomap for block_map" (2)" has been added to the 4.15-stable tree

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

gfs2: Fixes to "Implement iomap for block_map" (2)

to the 4.15-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:
gfs2-fixes-to-implement-iomap-for-block_map-2.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andreas Gruenbacher <[email protected]>
Date: Mon, 5 Mar 2018 06:18:25 -0700
Subject: gfs2: Fixes to "Implement iomap for block_map" (2)

From: Andreas Gruenbacher <[email protected]>

commit 3b5da96e4585a2788da6a07619bda3518d76eb30 upstream.

It turns out that commit 3229c18c0d6b2 'Fixes to "Implement iomap for block_map"' introduced another bug in gfs2_iomap_begin that can cause gfs2_block_map to set bh->b_size of an actual buffer to 0. This can lead to arbitrary incorrect behavior including crashes or disk corruption. Revert the incorrect part of that commit.

---
 fs/gfs2/bmap.c |    3 ---
 1 file changed, 3 deletions(-)

@@ -811,9 +811,6 @@ do_alloc:
 			iomap->length = hole_size(inode, lblock, &mp);
 		else
 			iomap->length = size - pos;
-	} else {
-		if (height <= ip->i_height)
-			iomap->length = hole_size(inode, lblock, &mp);
 	}
 	goto out_release;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/gfs2-clean-up-lookup-fillup-_metapath.patch queue-4.15/gfs2-fixes-to-implement-iomap-for-block_map-2.patch