linux-kernel - Re: [syzbot] [ext4?] general protection fault in jbd2_journal_dirty

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Message-ID: <20250512155843.20034-1-aha310510@gmail.com>
Date: Tue, 13 May 2025 00:58:43 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+de24c3fe3c4091051710@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] general protection fault in jbd2_journal_dirty_metadata

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

---
 fs/jbd2/transaction.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index cbc4785462f5..834fe30b79ff 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1528,7 +1528,6 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
 		goto out;
 	}
 
-	journal = transaction->t_journal;
 	spin_lock(&jh->b_state_lock);
 
 	if (is_handle_aborted(handle)) {
@@ -1543,6 +1542,8 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
 		goto out_unlock_bh;
 	}
 
+	journal = transaction->t_journal;
+
 	if (jh->b_modified == 0) {
 		/*
 		 * This buffer's got modified and becoming part
--