[IPV4/IPV6]: Add missing kmalloc failure checks.

net/ipv4/esp4.c

@@ -518,6 +518,8 @@ int esp_init_state(struct xfrm_state *x, void *args)
 	esp->conf.padlen = 0;
 	if (esp->conf.ivlen) {
 		esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL);
+		if (unlikely(esp->conf.ivec == NULL))
+			goto error;
 		get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
 	}
 	crypto_cipher_setkey(esp->conf.tfm, esp->conf.key, esp->conf.key_len);

net/ipv4/ip_output.c

@@ -761,8 +761,11 @@ int ip_append_data(struct sock *sk,
 		 */
 		opt = ipc->opt;
 		if (opt) {
-			if (inet->cork.opt == NULL)
+			if (inet->cork.opt == NULL) {
 				inet->cork.opt = kmalloc(sizeof(struct ip_options) + 40, sk->sk_allocation);
+				if (unlikely(inet->cork.opt == NULL))
+					return -ENOBUFS;
+			}
 			memcpy(inet->cork.opt, opt, sizeof(struct ip_options)+opt->optlen);
 			inet->cork.flags |= IPCORK_OPT;
 			inet->cork.addr = ipc->addr;

net/ipv6/esp6.c

@@ -422,6 +422,8 @@ int esp6_init_state(struct xfrm_state *x, void *args)
 	esp->conf.padlen = 0;
 	if (esp->conf.ivlen) {
 		esp->conf.ivec = kmalloc(esp->conf.ivlen, GFP_KERNEL);
+		if (unlikely(esp->conf.ivec == NULL))
+			goto error;
 		get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
 	}
 	crypto_cipher_setkey(esp->conf.tfm, esp->conf.key, esp->conf.key_len);

net/ipv6/ip6_output.c

@@ -816,9 +816,12 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, int offse
 		 * setup for corking
 		 */
 		if (opt) {
-			if (np->cork.opt == NULL)
+			if (np->cork.opt == NULL) {
 				np->cork.opt = kmalloc(opt->tot_len,
 						       sk->sk_allocation);
+				if (unlikely(np->cork.opt == NULL))
+					return -ENOBUFS;
+			}
 			memcpy(np->cork.opt, opt, opt->tot_len);
 			inet->cork.flags |= IPCORK_OPT;
 			/* need source address above miyazawa*/