[2.6.20.17 review 03/58] SCTP scope_id handling fix

[Willy Tarreau]

SCTP: Add scope_id validation for link-local binds

SCTP currently permits users to bind to link-local addresses,
but doesn't verify that the scope id specified at bind matches
the interface that the address is configured on.  It was report
that this can hang a system.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
---
 net/sctp/ipv6.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index ef36be0..c00c73c 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -874,6 +874,10 @@ static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 			dev = dev_get_by_index(addr->v6.sin6_scope_id);
 			if (!dev)
 				return 0;
+			if (!ipv6_chk_addr(&addr->v6.sin6_addr, dev, 0)) {
+				dev_put(dev);
+				return 0;
+			}
 			dev_put(dev);
 		}
 		af = opt->pf->af;
-- 
1.5.2.5

-- 
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