tipc: check return value of pskb_trim()

goto free_skb if an unexpected result is returned by pskb_tirm()
in tipc_crypto_rcv_complete().

Fixes: fc1b6d6 ("tipc: introduce TIPC encryption & authentication")
Signed-off-by: Yuanjun Gong <[email protected]>
Reviewed-by: Tung Nguyen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: AnnYugawa

net/tipc/crypto.c

@@ -1960,7 +1960,8 @@ static void tipc_crypto_rcv_complete(struct net *net, struct tipc_aead *aead,
 
 	skb_reset_network_header(*skb);
 	skb_pull(*skb, tipc_ehdr_size(ehdr));
-	pskb_trim(*skb, (*skb)->len - aead->authsize);
+	if (pskb_trim(*skb, (*skb)->len - aead->authsize))
+		goto free_skb;
 
 	/* Validate TIPCv2 message */
 	if (unlikely(!tipc_msg_validate(skb))) {