From: Boris Burkov <boris@bur.io>
Date: Tue, 2 Jul 2024 14:31:14 +0000 (-0700)
Subject: btrfs: fix folio refcount in __alloc_dummy_extent_buffer()
X-Git-Tag: v6.10-rc7~12^2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=a56c85fa2d59ab0780514741550edf87989a66e9;p=linux-block.git

btrfs: fix folio refcount in __alloc_dummy_extent_buffer()

Another improper use of __folio_put() in an error path after freshly
allocating pages/folios which returns them with the refcount initialized
to 1. The refactor from __free_pages() -> __folio_put() (instead of
folio_put) removed a refcount decrement found in __free_pages() and
folio_put but absent from __folio_put().

Fixes: 13df3775efca ("btrfs: cleanup metadata page pointer usage")
CC: stable@vger.kernel.org # 6.8+
Tested-by: Ed Tomlinson <edtoml@gmail.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index f688fab55251..958155cc43a8 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3553,7 +3553,7 @@ err:
 	for (int i = 0; i < num_folios; i++) {
 		if (eb->folios[i]) {
 			detach_extent_buffer_folio(eb, eb->folios[i]);
-			__folio_put(eb->folios[i]);
+			folio_put(eb->folios[i]);
 		}
 	}
 	__free_extent_buffer(eb);