[LU-15509] Ping buffer reference leaks in lnet_peer_data_present()

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Chris Horn
• Reporter: Chris Horn

Description

There are some additional places where ping buffer reference will leak in lnet_peer_data_present(). These are error paths so they should be rare.

static int lnet_peer_data_present(struct lnet_peer *lp)
__must_hold(&lp->lp_lock)
{
...
        if (list_empty(&lp->lp_peer_list))
                goto out; <<< Ref leak
...
        if (nid_is_lo0(&lp->lp_primary_nid)) {
                rc = lnet_peer_set_primary_nid(lp, nid, flags);
                if (!rc) <<< ref leak if rc is non-zero
                        rc = lnet_peer_merge_data(lp, pbuf);
...
                if (!lpni || lp == lpni->lpni_peer_net->lpn_peer) {
                        rc = lnet_peer_set_primary_nid(lp, nid, flags);
                        if (rc) { 
                                CERROR("Primary NID error %s versus %s: %d\n",
                                       libcfs_nidstr(&lp->lp_primary_nid),
                                       libcfs_nid2str(nid), rc);   <<< ref leak
                        } else {
                                rc = lnet_peer_merge_data(lp, pbuf);
                        }
...