linux-kernel - [PATCH] netfs: Prevent duplicate unlocking

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Message-ID: <20250905015925.2269482-1-lizhi.xu@windriver.com>
Date: Fri, 5 Sep 2025 09:59:25 +0800
From: Lizhi Xu <lizhi.xu@...driver.com>
To: <syzbot+b73c7d94a151e2ee1e9b@...kaller.appspotmail.com>
CC: <dhowells@...hat.com>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <netfs@...ts.linux.dev>,
        <pc@...guebit.org>, <syzkaller-bugs@...glegroups.com>
Subject: [PATCH] netfs: Prevent duplicate unlocking

The filio lock has been released here, so there is no need to jump to
error_folio_unlock to release it again.

Reported-by: syzbot+b73c7d94a151e2ee1e9b@...kaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b73c7d94a151e2ee1e9b
Signed-off-by: Lizhi Xu <lizhi.xu@...driver.com>
---
 fs/netfs/buffered_write.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c
index f27ea5099a68..09394ac2c180 100644
--- a/fs/netfs/buffered_write.c
+++ b/fs/netfs/buffered_write.c
@@ -347,7 +347,7 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter,
 		folio_put(folio);
 		ret = filemap_write_and_wait_range(mapping, fpos, fpos + flen - 1);
 		if (ret < 0)
-			goto error_folio_unlock;
+			goto out;
 		continue;
 
 	copied:
-- 
2.43.0