On Mon, Oct 19, 2020 at 08:43:05PM +0530, Muneendra Kumar M wrote:

Hi Tejun,
Thanks for the input.

quoted

quoted

+     cgrp = cgroup_get_from_kernfs_id(id);
+     if (!cgrp)
+             return -ENOENT;
+
+     css = cgroup_get_e_css(cgrp, &io_cgrp_subsys);
+     if (!css)
+             return -ENOENT;
+
+     blkcg = css_to_blkcg(css);
+     if (!blkcg)
+             return -ENOENT;
+		return -EINVAL;
+	strlcpy(blkcg->app_id, buf, len);

quoted

Shouldn't the cgrp and css be put before exit?

[Muneendra]Correct me if iam wrong.
You mean to add cgroup_put(cgrp) and css_put(css) before exit ?

Yeah, as-is it'd leak references each time the function is called.

Thanks.

-- 
tejun