From 71947173cef279be5eed209ec28f8c11f9d73159 Mon Sep 17 00:00:00 2001
From: Zhang Tianci <zhangtianci.1997@bytedance.com>
Date: Thu, 25 Dec 2025 19:11:56 +0800
Subject: [PATCH] fuse: set ff->flock only on success

If FUSE_SETLK fails (e.g., due to EWOULDBLOCK), we shall not set
FUSE_RELEASE_FLOCK_UNLOCK in fuse_file_release().

Reported-by: Li Yichao <liyichao.1@bytedance.com>
Signed-off-by: Zhang Tianci <zhangtianci.1997@bytedance.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---
 fs/fuse/file.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 8c8d9f6d8f72..9160836664b0 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2569,8 +2569,9 @@ static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
 		struct fuse_file *ff = file->private_data;
 
 		/* emulate flock with POSIX locks */
-		ff->flock = true;
 		err = fuse_setlk(file, fl, 1);
+		if (!err)
+			ff->flock = true;
 	}
 
 	return err;