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sctp: use SCTP_FUTURE_ASSOC for SCTP_MAXSEG sockopt 

Check with SCTP_FUTURE_ASSOC instead in
sctp_set/getsockopt_maxseg, it's compatible with 0.
Also check asoc_id early as other sctp setsockopts does.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2019-01-28 15:08:27 +08:00 committed by David S. Miller
parent 8889394df2
commit 6fd769beb0
1 changed files with 7 additions and 5 deletions
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12
net/sctp/socket.c
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@ -3322,7 +3322,7 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
current->comm, task_pid_nr(current));
if (copy_from_user(&val, optval, optlen))
return -EFAULT;
params.assoc_id = 0;
params.assoc_id = SCTP_FUTURE_ASSOC;
} else if (optlen == sizeof(struct sctp_assoc_value)) {
if (copy_from_user(&params, optval, optlen))
return -EFAULT;
@ -3332,6 +3332,9 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
}
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP))
return -EINVAL;
if (val) {
int min_len, max_len;
@ -3349,8 +3352,6 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
asoc->user_frag = val;
sctp_assoc_update_frag_point(asoc);
} else {
if (params.assoc_id && sctp_style(sk, UDP))
return -EINVAL;
sp->user_frag = val;
}
@ -6503,7 +6504,7 @@ static int sctp_getsockopt_maxseg(struct sock *sk, int len,
"Use of int in maxseg socket option.\n"
"Use struct sctp_assoc_value instead\n",
current->comm, task_pid_nr(current));
params.assoc_id = 0;
params.assoc_id = SCTP_FUTURE_ASSOC;
} else if (len >= sizeof(struct sctp_assoc_value)) {
len = sizeof(struct sctp_assoc_value);
if (copy_from_user(&params, optval, len))
@ -6512,7 +6513,8 @@ static int sctp_getsockopt_maxseg(struct sock *sk, int len,
return -EINVAL;
asoc = sctp_id2assoc(sk, params.assoc_id);
if (!asoc && params.assoc_id && sctp_style(sk, UDP))
if (!asoc && params.assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP))
return -EINVAL;
if (asoc)