Fix bugs which can result in a panic when an non-SCTP socket it

used with an sctp_ system-call which expects an SCTP socket.

MFC after: 3 days.

1 files changed, 16 insertions, 0 deletions

diff --git a/sys/kern/uipc_syscalls.c b/sys/kern/uipc_syscalls.c
index 3b44848..4502e43 100644
--- a/sys/kern/uipc_syscalls.c
+++ b/sys/kern/uipc_syscalls.c
@@ -2321,6 +2321,10 @@ sys_sctp_peeloff(td, uap)
 	error = fgetsock(td, uap->sd, CAP_PEELOFF, &head, &fflag);
 	if (error)
 		goto done2;
+	if (head->so_proto->pr_protocol != IPPROTO_SCTP) {
+		error = EOPNOTSUPP;
+		goto done2;
+	}
 	error = sctp_can_peel_off(head, (sctp_assoc_t)uap->name);
 	if (error)
 		goto done2;
@@ -2443,6 +2447,10 @@ sys_sctp_generic_sendmsg (td, uap)
 	iov[0].iov_len = uap->mlen;
 
 	so = (struct socket *)fp->f_data;
+	if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
+		error = EOPNOTSUPP;
+		goto sctp_bad;
+	}
 #ifdef MAC
 	error = mac_socket_check_send(td->td_ucred, so);
 	if (error)
@@ -2557,6 +2565,10 @@ sys_sctp_generic_sendmsg_iov(td, uap)
 #endif
 
 	so = (struct socket *)fp->f_data;
+	if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
+		error = EOPNOTSUPP;
+		goto sctp_bad;
+	}
 #ifdef MAC
 	error = mac_socket_check_send(td->td_ucred, so);
 	if (error)
@@ -2662,6 +2674,10 @@ sys_sctp_generic_recvmsg(td, uap)
 		goto out1;
 
 	so = fp->f_data;
+	if (so->so_proto->pr_protocol != IPPROTO_SCTP) {
+		error = EOPNOTSUPP;
+		goto out;
+	}
 #ifdef MAC
 	error = mac_socket_check_receive(td->td_ucred, so);
 	if (error) {