[LU-18016] kfilnd_tn_alloc() may call kfilnd_ep_put_key() unbalanced with kfilnd_ep_get_key()

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: WC Triage
• Reporter: Vladimir Saveliev

Description

kfilnd_tn_alloc(..., bool need_key)
...
	if (need_key) {
		rc = kfilnd_ep_get_key(ep);
..
err_put_key:
        kfilnd_ep_put_key(ep, key);   <<< this causes NULL pointer dereference if need_key is false