From 4c31bc6b1e2ee9c21608506431783dfa525b9989 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Tue, 30 Jul 2019 20:38:19 +0800 Subject: [PATCH] sctp: only copy the available addr data in sctp_transport_init 'addr' passed to sctp_transport_init is not always a whole size of union sctp_addr, like the path: sctp_sendmsg() -> sctp_sendmsg_new_asoc() -> sctp_assoc_add_peer() -> sctp_transport_new() -> sctp_transport_init() In the next patches, we will also pass the address length of data only to sctp_assoc_add_peer(). So sctp_transport_init() should copy the only available data from addr to peer->ipaddr, instead of 'peer->ipaddr = *addr' which may cause slab-out-of-bounds. Signed-off-by: Xin Long Signed-off-by: David S. Miller --- net/sctp/transport.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/sctp/transport.c b/net/sctp/transport.c index e2f8e369cd08..7235a6032671 100644 --- a/net/sctp/transport.c +++ b/net/sctp/transport.c @@ -43,8 +43,8 @@ static struct sctp_transport *sctp_transport_init(struct net *net, gfp_t gfp) { /* Copy in the address. */ - peer->ipaddr = *addr; peer->af_specific = sctp_get_af_specific(addr->sa.sa_family); + memcpy(&peer->ipaddr, addr, peer->af_specific->sockaddr_len); memset(&peer->saddr, 0, sizeof(union sctp_addr)); peer->sack_generation = 0;