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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Magnus Karlsson , Maciej Fijalkowski , Stanislav Fomichev , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Jon Maloy , Alexandra Winter , Thorsten Winkler , James Chapman , David Howells , Marc Dionne , David Heidelberg , Samuel Ortiz , linux-atm-general@lists.sourceforge.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, tipc-discussion@lists.sourceforge.net, linux-s390@vger.kernel.org, linux-afs@lists.infradead.org, oe-linux-nfc@lists.linux.dev, kernel-team@meta.com Subject: Re: [PATCH net-next 4/6] l2tp: ppp: convert to getsockopt_iter Message-ID: References: <20260513-getsock_four-v1-0-fe7f0e756fac@debian.org> <20260513-getsock_four-v1-4-fe7f0e756fac@debian.org> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260513-getsock_four-v1-4-fe7f0e756fac@debian.org> On 05/13, Breno Leitao wrote: > Convert PPPoL2TP socket's getsockopt implementation to use the new > getsockopt_iter callback with sockopt_t. > > Key changes: > - Replace (char __user *optval, int __user *optlen) with sockopt_t *opt > - Use opt->optlen for buffer length (input) and returned size (output) > - Use copy_to_iter() instead of put_user()/copy_to_user() > > Signed-off-by: Breno Leitao > --- > net/l2tp/l2tp_ppp.c | 18 ++++++++---------- > 1 file changed, 8 insertions(+), 10 deletions(-) > > diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c > index 99d6582f41de2..4c7a1152b20ba 100644 > --- a/net/l2tp/l2tp_ppp.c > +++ b/net/l2tp/l2tp_ppp.c > @@ -59,6 +59,7 @@ > #include > #include > #include > +#include > > #include > #include > @@ -1317,7 +1318,7 @@ static int pppol2tp_session_getsockopt(struct sock *sk, > * or the special tunnel type. > */ > static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, > - char __user *optval, int __user *optlen) > + sockopt_t *opt) > { > struct sock *sk = sock->sk; > struct l2tp_session *session; > @@ -1328,9 +1329,7 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, > if (level != SOL_PPPOL2TP) > return -EINVAL; > > - if (get_user(len, optlen)) > - return -EFAULT; > - > + len = opt->optlen; > if (len < 0) > return -EINVAL; > > @@ -1358,12 +1357,11 @@ static int pppol2tp_getsockopt(struct socket *sock, int level, int optname, > goto end_put_sess; > } > > - err = -EFAULT; > - if (put_user(len, optlen)) > - goto end_put_sess; > - > - if (copy_to_user((void __user *)optval, &val, len)) > + opt->optlen = len; > + if (copy_to_iter(&val, len, &opt->iter_out) != len) { > + err = -EFAULT; > goto end_put_sess; > + } > > err = 0; nit: if you're moving `err = -EFAULT`, you might as well remove this `err = 0` ? Acked-by: Stanislav Fomichev