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sctp: sctp_addr_id2transport should verify the addr before looking up assoc
sctp_addr_id2transport is a function for sockopt to look up assoc by address. As the address is from userspace, it can be a v4-mapped v6 address. But in sctp protocol stack, it always handles a v4-mapped v6 address as a v4 address. So it's necessary to convert it to a v4 address before looking up assoc by address. This patch is to fix it by calling sctp_verify_addr in which it can do this conversion before calling sctp_endpoint_lookup_assoc, just like what sctp_sendmsg and __sctp_connect do for the address from users. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 5 additions and 1 deletions
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@ -235,8 +235,12 @@ static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
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sctp_assoc_t id)
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{
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struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
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struct sctp_transport *transport;
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struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
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union sctp_addr *laddr = (union sctp_addr *)addr;
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struct sctp_transport *transport;
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if (sctp_verify_addr(sk, laddr, af->sockaddr_len))
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return NULL;
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addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
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laddr,
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