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;