From 8a2409d3566b3965347d73b4ca008eaa76f4bbfc Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 19 Jul 2020 09:21:49 +0200 Subject: sctp: pass a kernel pointer to sctp_setsockopt_default_sndinfo Use the kernel pointer that sctp_setsockopt has available instead of directly handling the user pointer. Signed-off-by: Christoph Hellwig Signed-off-by: David S. Miller --- net/sctp/socket.c | 49 +++++++++++++++++++++++-------------------------- 1 file changed, 23 insertions(+), 26 deletions(-) (limited to 'net/sctp') diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 9bcbb065cf9e..6695fa1cb0ca 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -2925,54 +2925,51 @@ static int sctp_setsockopt_default_send_param(struct sock *sk, * (SCTP_DEFAULT_SNDINFO) */ static int sctp_setsockopt_default_sndinfo(struct sock *sk, - char __user *optval, + struct sctp_sndinfo *info, unsigned int optlen) { struct sctp_sock *sp = sctp_sk(sk); struct sctp_association *asoc; - struct sctp_sndinfo info; - if (optlen != sizeof(info)) + if (optlen != sizeof(*info)) return -EINVAL; - if (copy_from_user(&info, optval, optlen)) - return -EFAULT; - if (info.snd_flags & + if (info->snd_flags & ~(SCTP_UNORDERED | SCTP_ADDR_OVER | SCTP_ABORT | SCTP_EOF)) return -EINVAL; - asoc = sctp_id2assoc(sk, info.snd_assoc_id); - if (!asoc && info.snd_assoc_id > SCTP_ALL_ASSOC && + asoc = sctp_id2assoc(sk, info->snd_assoc_id); + if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP)) return -EINVAL; if (asoc) { - asoc->default_stream = info.snd_sid; - asoc->default_flags = info.snd_flags; - asoc->default_ppid = info.snd_ppid; - asoc->default_context = info.snd_context; + asoc->default_stream = info->snd_sid; + asoc->default_flags = info->snd_flags; + asoc->default_ppid = info->snd_ppid; + asoc->default_context = info->snd_context; return 0; } if (sctp_style(sk, TCP)) - info.snd_assoc_id = SCTP_FUTURE_ASSOC; + info->snd_assoc_id = SCTP_FUTURE_ASSOC; - if (info.snd_assoc_id == SCTP_FUTURE_ASSOC || - info.snd_assoc_id == SCTP_ALL_ASSOC) { - sp->default_stream = info.snd_sid; - sp->default_flags = info.snd_flags; - sp->default_ppid = info.snd_ppid; - sp->default_context = info.snd_context; + if (info->snd_assoc_id == SCTP_FUTURE_ASSOC || + info->snd_assoc_id == SCTP_ALL_ASSOC) { + sp->default_stream = info->snd_sid; + sp->default_flags = info->snd_flags; + sp->default_ppid = info->snd_ppid; + sp->default_context = info->snd_context; } - if (info.snd_assoc_id == SCTP_CURRENT_ASSOC || - info.snd_assoc_id == SCTP_ALL_ASSOC) { + if (info->snd_assoc_id == SCTP_CURRENT_ASSOC || + info->snd_assoc_id == SCTP_ALL_ASSOC) { list_for_each_entry(asoc, &sp->ep->asocs, asocs) { - asoc->default_stream = info.snd_sid; - asoc->default_flags = info.snd_flags; - asoc->default_ppid = info.snd_ppid; - asoc->default_context = info.snd_context; + asoc->default_stream = info->snd_sid; + asoc->default_flags = info->snd_flags; + asoc->default_ppid = info->snd_ppid; + asoc->default_context = info->snd_context; } } @@ -4695,7 +4692,7 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname, retval = sctp_setsockopt_default_send_param(sk, kopt, optlen); break; case SCTP_DEFAULT_SNDINFO: - retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen); + retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen); break; case SCTP_PRIMARY_ADDR: retval = sctp_setsockopt_primary_addr(sk, optval, optlen); -- cgit v1.2.3