netdev - [PATCH net] sctp: asconf's process should verify address parameter is in the beginning

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Date:	Mon, 24 Aug 2015 18:07:58 +0800
From:	Xin Long <lucien.xin@...il.com>
To:	network dev <netdev@...r.kernel.org>
Cc:	mleitner@...hat.com, davem@...emloft.net
Subject: [PATCH net] sctp: asconf's process should verify address parameter is in the beginning

in sctp_process_asconf(), we get address parameter from the beginning of the
addip params. but we never check if it's really there. if the addr param is not
there, it still can pass sctp_verify_asconf(), then to be handled by
sctp_process_asconf(), it will not be safe.

so add a code in sctp_verify_asconf() to check the address parameter is in the
beginning, or return false to send abort.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/sctp/sm_make_chunk.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 0ee5ca7..a2a72d5 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3122,6 +3122,14 @@ bool sctp_verify_asconf(const struct sctp_association *asoc,
 	union sctp_params param;
 	bool addr_param_seen = false;
 
+	if(addr_param_needed){
+		/* Ensure the address parameter is in the beginning */
+		param.v = chunk->skb->data + sizeof(sctp_addiphdr_t);
+		if (param.p->type != SCTP_PARAM_IPV4_ADDRESS &&
+		    param.p->type != SCTP_PARAM_IPV6_ADDRESS)
+			return false;
+	}
+
 	sctp_walk_params(param, addip, addip_hdr.params) {
 		size_t length = ntohs(param.p->length);
 
-- 
2.1.0

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