From 364700cf8fd54f54ad08313464105a414e3bccb7 Mon Sep 17 00:00:00 2001 From: Guillaume Nault Date: Thu, 6 Apr 2017 18:31:20 +0200 Subject: l2tp: don't mask errors in pppol2tp_setsockopt() pppol2tp_setsockopt() unconditionally overwrites the error value returned by pppol2tp_tunnel_setsockopt() or pppol2tp_session_setsockopt(), thus hiding errors from userspace. Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts") Signed-off-by: Guillaume Nault Signed-off-by: David S. Miller --- net/l2tp/l2tp_ppp.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'net/l2tp') diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index 861b255a2d51..973a9185b276 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -1383,8 +1383,6 @@ static int pppol2tp_setsockopt(struct socket *sock, int level, int optname, } else err = pppol2tp_session_setsockopt(sk, session, optname, val); - err = 0; - end_put_sess: sock_put(sk); end: -- cgit From 321a52a39189d5e4af542f7dcdc07bba4545cf5d Mon Sep 17 00:00:00 2001 From: Guillaume Nault Date: Thu, 6 Apr 2017 18:31:21 +0200 Subject: l2tp: don't mask errors in pppol2tp_getsockopt() pppol2tp_getsockopt() doesn't take into account the error code returned by pppol2tp_tunnel_getsockopt() or pppol2tp_session_getsockopt(). If error occurs there, pppol2tp_getsockopt() continues unconditionally and reports erroneous values. Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts") Signed-off-by: Guillaume Nault Signed-off-by: David S. Miller --- net/l2tp/l2tp_ppp.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'net/l2tp') diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index 973a9185b276..32ea0f3d868c 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -1505,8 +1505,13 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, err = pppol2tp_tunnel_getsockopt(sk, tunnel, optname, &val); sock_put(ps->tunnel_sock); - } else + if (err) + goto end_put_sess; + } else { err = pppol2tp_session_getsockopt(sk, session, optname, &val); + if (err) + goto end_put_sess; + } err = -EFAULT; if (put_user(len, optlen)) -- cgit