This is a note to let you know that I've just added the patch titled
btrfs: fix extent buffer leak on failure to copy root
to the 5.11-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-buffer-leak-on-failure-to-copy-root.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 72c9925f87c8b74f36f8e75a4cd93d964538d3ca Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@xxxxxxxx>
Date: Thu, 4 Feb 2021 14:35:44 +0000
Subject: btrfs: fix extent buffer leak on failure to copy root
From: Filipe Manana <fdmanana@xxxxxxxx>
commit 72c9925f87c8b74f36f8e75a4cd93d964538d3ca upstream.
At btrfs_copy_root(), if the call to btrfs_inc_ref() fails we end up
returning without unlocking and releasing our reference on the extent
buffer named "cow" we previously allocated with btrfs_alloc_tree_block().
So fix that by unlocking the extent buffer and dropping our reference on
it before returning.
Fixes: be20aa9dbadc8c ("Btrfs: Add mount option to turn off data cow")
CC: stable@xxxxxxxxxxxxxxx # 4.4+
Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/ctree.c | 2 ++
1 file changed, 2 insertions(+)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -222,6 +222,8 @@ int btrfs_copy_root(struct btrfs_trans_h
else
ret = btrfs_inc_ref(trans, root, cow, 0);
if (ret) {
+ btrfs_tree_unlock(cow);
+ free_extent_buffer(cow);
btrfs_abort_transaction(trans, ret);
return ret;
}
Patches currently in stable-queue which might be from fdmanana@xxxxxxxx are
queue-5.11/btrfs-fix-double-accounting-of-ordered-extent-for-su.patch
queue-5.11/btrfs-fix-extent-buffer-leak-on-failure-to-copy-root.patch
