Patch "Btrfs: fix extent state leak from tree log" has been added to the 4.9-stable tree

Patch "Btrfs: fix extent state leak from tree log" has been added to the 4.9-stable tree

[gregkh]

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

    Btrfs: fix extent state leak from tree log

to the 4.9-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:
     btrfs-fix-extent-state-leak-from-tree-log.patch
and it can be found in the queue-4.9 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 55237a5f2431a72435e3ed39e4306e973c0446b7 Mon Sep 17 00:00:00 2001
From: Liu Bo <bo.li.liu@oracle.com>
Date: Thu, 25 Jan 2018 11:02:52 -0700
Subject: Btrfs: fix extent state leak from tree log

From: Liu Bo <bo.li.liu@oracle.com>

commit 55237a5f2431a72435e3ed39e4306e973c0446b7 upstream.

It's possible that btrfs_sync_log() bails out after one of the two
btrfs_write_marked_extents() which convert extent state's state bit into
EXTENT_NEED_WAIT from EXTENT_DIRTY/EXTENT_NEW, however only EXTENT_DIRTY
and EXTENT_NEW are searched by free_log_tree() so that those extent states
with EXTENT_NEED_WAIT lead to memory leak.

cc: <stable@vger.kernel.org>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/btrfs/tree-log.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -3013,13 +3013,14 @@ static void free_log_tree(struct btrfs_t
 
 	while (1) {
 		ret = find_first_extent_bit(&log->dirty_log_pages,
-				0, &start, &end, EXTENT_DIRTY | EXTENT_NEW,
+				0, &start, &end,
+				EXTENT_DIRTY | EXTENT_NEW | EXTENT_NEED_WAIT,
 				NULL);
 		if (ret)
 			break;
 
 		clear_extent_bits(&log->dirty_log_pages, start, end,
-				  EXTENT_DIRTY | EXTENT_NEW);
+				  EXTENT_DIRTY | EXTENT_NEW | EXTENT_NEED_WAIT);
 	}
 
 	/*


Patches currently in stable-queue which might be from bo.li.liu@oracle.com are

queue-4.9/btrfs-fix-btrfs_evict_inode-to-handle-abnormal-inodes-correctly.patch
queue-4.9/btrfs-fix-crash-due-to-not-cleaning-up-tree-log-block-s-dirty-bits.patch
queue-4.9/btrfs-fix-extent-state-leak-from-tree-log.patch
queue-4.9/btrfs-fix-unexpected-eexist-when-creating-new-inode.patch
queue-4.9/btrfs-fix-deadlock-in-run_delalloc_nocow.patch