linux-kernel - [PATCH 4.19 40/54] ext4: fix potential htree corruption when growing large

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Date:   Tue, 10 Aug 2021 19:30:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Благодаренко Артём 
        <artem.blagodarenko@...il.com>, Denis <denis@...elsoft.com>,
        Theodore Tso <tytso@....edu>, stable@...nel.org
Subject: [PATCH 4.19 40/54] ext4: fix potential htree corruption when growing large_dir directories

From: Theodore Ts'o <tytso@....edu>

commit 877ba3f729fd3d8ef0e29bc2a55e57cfa54b2e43 upstream.

Commit b5776e7524af ("ext4: fix potential htree index checksum
corruption) removed a required restart when multiple levels of index
nodes need to be split.  Fix this to avoid directory htree corruptions
when using the large_dir feature.

Cc: stable@...nel.org # v5.11
Cc: Благодаренко Артём <artem.blagodarenko@...il.com>
Fixes: b5776e7524af ("ext4: fix potential htree index checksum corruption)
Reported-by: Denis <denis@...elsoft.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/ext4/namei.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2317,7 +2317,7 @@ again:
 				goto journal_error;
 			err = ext4_handle_dirty_dx_node(handle, dir,
 							frame->bh);
-			if (err)
+			if (restart || err)
 				goto journal_error;
 		} else {
 			struct dx_root *dxroot;