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authorXin Long <lucien.xin@gmail.com>2017-01-24 09:01:53 +0300
committerDavid S. Miller <davem@davemloft.net>2017-01-25 20:26:55 +0300
commit6f29a130613191d3c6335169febe002cba00edf5 (patch)
treed2581877c6cae4819e17ff33897f930d05ce4e65 /net/sctp
parentec221a17a638dec4d9b0ba3e5817113f249dd194 (diff)
downloadlinux-6f29a130613191d3c6335169febe002cba00edf5.tar.xz
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>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/socket.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 318c6786d653..37eeab7899fc 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -235,8 +235,12 @@ static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
sctp_assoc_t id)
{
struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
- struct sctp_transport *transport;
+ struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
union sctp_addr *laddr = (union sctp_addr *)addr;
+ struct sctp_transport *transport;
+
+ if (sctp_verify_addr(sk, laddr, af->sockaddr_len))
+ return NULL;
addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
laddr,