[LTS 9.4] Multiple VULNS 31/12/25

mm/zswap.c

@@ -1002,6 +1002,22 @@ static int zswap_writeback_entry(struct zpool *pool, unsigned long handle)
 		goto fail;
 
 	case ZSWAP_SWAPCACHE_NEW: /* page is locked */
+		/*
+		 * Having a local reference to the zswap entry doesn't exclude
+		 * swapping from invalidating and recycling the swap slot. Once
+		 * the swapcache is secured against concurrent swapping to and
+		 * from the slot, recheck that the entry is still current before
+		 * writing.
+		 */
+		spin_lock(&tree->lock);
+		if (zswap_rb_search(&tree->rbroot, entry->offset) != entry) {
+			spin_unlock(&tree->lock);
+			delete_from_swap_cache(page_folio(page));
+			ret = -ENOMEM;
+			goto fail;
+		}
+		spin_unlock(&tree->lock);
+
 		/* decompress */
 		acomp_ctx = raw_cpu_ptr(entry->pool->acomp_ctx);
 		dlen = PAGE_SIZE;

net/ipv4/tcp.c

@@ -3097,6 +3097,7 @@ int tcp_disconnect(struct sock *sk, int flags)
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct tcp_sock *tp = tcp_sk(sk);
 	int old_state = sk->sk_state;
+	struct request_sock *req;
 	u32 seq;
 
 	if (old_state != TCP_CLOSE)
@@ -3207,6 +3208,10 @@ int tcp_disconnect(struct sock *sk, int flags)
 
 
 	/* Clean up fastopen related fields */
+	req = rcu_dereference_protected(tp->fastopen_rsk,
+					lockdep_sock_is_held(sk));
+	if (req)
+		reqsk_fastopen_remove(sk, req, false);
 	tcp_free_fastopen_req(tp);
 	inet->defer_connect = 0;
 	tp->fastopen_client_fail = 0;

net/ipv4/tcp_input.c

@@ -7006,7 +7006,6 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
 				    &foc, TCP_SYNACK_FASTOPEN, skb);
 		/* Add the child socket directly into the accept queue */
 		if (!inet_csk_reqsk_queue_add(sk, req, fastopen_sk)) {
-			reqsk_fastopen_remove(fastopen_sk, req, false);
 			bh_unlock_sock(fastopen_sk);
 			sock_put(fastopen_sk);
 			goto drop_and_free;

net/wireless/scan.c

@@ -1763,7 +1763,8 @@ cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
 			 */
 
 			f = rcu_access_pointer(new->pub.beacon_ies);
-			kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
+			if (!new->pub.hidden_beacon_bss)
+				kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
 			return false;
 		}