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Date: Fri, 27 Apr 2018 15:58:15 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, syzbot+a70ac890b23b1bf29f5c@...kaller.appspotmail.com, Guillaume Nault <g.nault@...halink.fr>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 4.16 13/81] l2tp: check sockaddr length in pppol2tp_connect() 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Guillaume Nault <g.nault@...halink.fr> [ Upstream commit eb1c28c05894a4b1f6b56c5bf072205e64cfa280 ] Check sockaddr_len before dereferencing sp->sa_protocol, to ensure that it actually points to valid data. Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts") Reported-by: syzbot+a70ac890b23b1bf29f5c@...kaller.appspotmail.com Signed-off-by: Guillaume Nault <g.nault@...halink.fr> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/l2tp/l2tp_ppp.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -619,6 +619,13 @@ static int pppol2tp_connect(struct socke lock_sock(sk); error = -EINVAL; + + if (sockaddr_len != sizeof(struct sockaddr_pppol2tp) && + sockaddr_len != sizeof(struct sockaddr_pppol2tpv3) && + sockaddr_len != sizeof(struct sockaddr_pppol2tpin6) && + sockaddr_len != sizeof(struct sockaddr_pppol2tpv3in6)) + goto end; + if (sp->sa_protocol != PX_PROTO_OL2TP) goto end;
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