linux-kernel - [PATCH 4.20 323/352] cuse: fix ioctl

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Date:   Mon, 11 Feb 2019 15:19:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andreas Steinmetz <ast@...dv.de>,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: [PATCH 4.20 323/352] cuse: fix ioctl

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Miklos Szeredi <mszeredi@...hat.com>

commit 8a3177db59cd644fde05ba9efee29392dfdec8aa upstream.

cuse_process_init_reply() doesn't initialize fc->max_pages and thus all
cuse bases ioctls fail with ENOMEM.

Reported-by: Andreas Steinmetz <ast@...dv.de>
Fixes: 5da784cce430 ("fuse: add max_pages to init_out")
Cc: <stable@...r.kernel.org> # v4.20
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/fuse/inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -628,6 +628,7 @@ void fuse_conn_init(struct fuse_conn *fc
 	get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
 	fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
 	fc->user_ns = get_user_ns(user_ns);
+	fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
 }
 EXPORT_SYMBOL_GPL(fuse_conn_init);
 
@@ -1162,7 +1163,6 @@ static int fuse_fill_super(struct super_
 	fc->user_id = d.user_id;
 	fc->group_id = d.group_id;
 	fc->max_read = max_t(unsigned, 4096, d.max_read);
-	fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;
 
 	/* Used by get_root_inode() */
 	sb->s_fs_info = fc;