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Subject[PATCH 4.20 323/352] cuse: fix ioctl
Date
4.20-stable review patch.  If anyone has any objections, please let me know.

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

From: Miklos Szeredi <mszeredi@redhat.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@domdv.de>
Fixes: 5da784cce430 ("fuse: add max_pages to init_out")
Cc: <stable@vger.kernel.org> # v4.20
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;

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