[PATCH 18/49] sctp: pass a kernel pointer to sctp_setsockopt_mappedv4
From: Christoph Hellwig <hch@lst.de>
Date: 2020-05-21 17:48:34
Also in:
linux-sctp
Subsystem:
networking [general], sctp protocol, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Marcelo Ricardo Leitner, Xin Long, Linus Torvalds
Use the kernel pointer that sctp_setsockopt has available instead of directly handling the user pointer. Signed-off-by: Christoph Hellwig <hch@lst.de> --- net/sctp/socket.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 161acd6253e06..41407d0ef2eca 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c@@ -3170,16 +3170,14 @@ static int sctp_setsockopt_associnfo(struct sock *sk, * addresses and a user will receive both PF_INET6 and PF_INET type * addresses on the socket. */ -static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen) +static int sctp_setsockopt_mappedv4(struct sock *sk, int *val, + unsigned int optlen) { - int val; struct sctp_sock *sp = sctp_sk(sk); if (optlen < sizeof(int)) return -EINVAL; - if (get_user(val, (int __user *)optval)) - return -EFAULT; - if (val) + if (*val) sp->v4mapped = 1; else sp->v4mapped = 0;
@@ -4693,7 +4691,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, retval = sctp_setsockopt_associnfo(sk, kopt, optlen); break; case SCTP_I_WANT_MAPPED_V4_ADDR: - retval = sctp_setsockopt_mappedv4(sk, optval, optlen); + retval = sctp_setsockopt_mappedv4(sk, kopt, optlen); break; case SCTP_MAXSEG: retval = sctp_setsockopt_maxseg(sk, optval, optlen);
--
2.26.2