EAP-IKEv2 peer: Avoid undefined behavior in pointer arithmetic

Reorder terms in a way that no invalid pointers are generated with
pos+len operations. end-pos is always defined (with a valid pos pointer)
while pos+len could end up pointing beyond the end pointer which would
be undefined behavior.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/eap_peer/ikev2.c

@@ -128,7 +128,7 @@ static int ikev2_parse_transform(struct ikev2_proposal_data *prop,
 
 	t = (const struct ikev2_transform *) pos;
 	transform_len = WPA_GET_BE16(t->transform_length);
-	if (transform_len < (int) sizeof(*t) || pos + transform_len > end) {
+	if (transform_len < (int) sizeof(*t) || transform_len > end - pos) {
 		wpa_printf(MSG_INFO, "IKEV2: Invalid transform length %d",
 			   transform_len);
 		return -1;
@@ -248,7 +248,7 @@ static int ikev2_parse_proposal(struct ikev2_proposal_data *prop,
 
 	ppos = (const u8 *) (p + 1);
 	pend = pos + proposal_len;
-	if (ppos + p->spi_size > pend) {
+	if (p->spi_size > pend - ppos) {
 		wpa_printf(MSG_INFO, "IKEV2: Not enough room for SPI "
 			   "in proposal");
 		return -1;