[PATCH 7/8] mka: add check for body length when decoding peers

[Sabrina Dubroca]

The standard says that the body length must be a multiple of 16B.

Signed-off-by: Sabrina Dubroca <sd at queasysnail.net>
---
 src/pae/ieee802_1x_kay.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/pae/ieee802_1x_kay.c b/src/pae/ieee802_1x_kay.c
index 4c050eb9866a..3e349ad84169 100644
--- a/src/pae/ieee802_1x_kay.c
+++ b/src/pae/ieee802_1x_kay.c
@@ -999,6 +999,12 @@ static int ieee802_1x_mka_decode_live_peer_body(
 
 	hdr = (const struct ieee802_1x_mka_hdr *) peer_msg;
 	body_len = get_mka_param_body_len(hdr);
+	if (body_len % 16 != 0) {
+		wpa_printf(MSG_ERROR,
+			   "KaY: MKA Peer Packet Body Length (%zu bytes) should be a multiple of 16 octets",
+			   body_len);
+		return -1;
+	}
 
 	for (i = 0; i < body_len; i += MI_LEN + sizeof(peer_mn)) {
 		peer_mi = MKA_HDR_LEN + peer_msg + i;
@@ -1053,6 +1059,12 @@ ieee802_1x_mka_decode_potential_peer_body(
 
 	hdr = (struct ieee802_1x_mka_hdr *) peer_msg;
 	body_len = get_mka_param_body_len(hdr);
+	if (body_len % 16 != 0) {
+		wpa_printf(MSG_ERROR,
+			   "KaY: MKA Peer Packet Body Length (%zu bytes) should be a multiple of 16 octets",
+			   body_len);
+		return -1;
+	}
 
 	for (i = 0; i < body_len; i += MI_LEN + sizeof(peer_mn)) {
 		peer_mi = MKA_HDR_LEN + peer_msg + i;
-- 
2.9.0