This is a note to let you know that I've just added the patch titled
btrfs: fix extent buffer leak after tree mod log failure at split_node()
to the 5.15-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:
btrfs-fix-extent-buffer-leak-after-tree-mod-log-failure-at-split_node.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ede600e497b1461d06d22a7d17703d9096868bc3 Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@xxxxxxxx>
Date: Thu, 8 Jun 2023 11:27:38 +0100
Subject: btrfs: fix extent buffer leak after tree mod log failure at split_node()
From: Filipe Manana <fdmanana@xxxxxxxx>
commit ede600e497b1461d06d22a7d17703d9096868bc3 upstream.
At split_node(), if we fail to log the tree mod log copy operation, we
return without unlocking the split extent buffer we just allocated and
without decrementing the reference we own on it. Fix this by unlocking
it and decrementing the ref count before returning.
Fixes: 5de865eebb83 ("Btrfs: fix tree mod logging")
CC: stable@xxxxxxxxxxxxxxx # 5.4+
Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>
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
@@ -2637,6 +2637,8 @@ static noinline int split_node(struct bt
ret = btrfs_tree_mod_log_eb_copy(split, c, 0, mid, c_nritems - mid);
if (ret) {
+ btrfs_tree_unlock(split);
+ free_extent_buffer(split);
btrfs_abort_transaction(trans, ret);
return ret;
}
Patches currently in stable-queue which might be from fdmanana@xxxxxxxx are
queue-5.15/btrfs-bail-out-reclaim-process-if-filesystem-is-read-only.patch
queue-5.15/btrfs-do-not-bug_on-on-tree-mod-log-failure-at-balan.patch
queue-5.15/btrfs-fix-extent-buffer-leak-after-tree-mod-log-failure-at-split_node.patch
queue-5.15/btrfs-move-out-now-unused-bg-from-the-reclaim-list.patch
queue-5.15/btrfs-fix-race-when-deleting-quota-root-from-the-dirty-cow-roots-list.patch
queue-5.15/btrfs-delete-unused-bgs-while-reclaiming-bgs.patch
queue-5.15/btrfs-do-not-bug_on-on-tree-mod-log-failure-at-__btrfs_cow_block.patch
