svn commit: r232723 - head/sys/netinet

[Michael Tuexen]

Author: tuexen
Date: Fri Mar  9 13:12:33 2012
New Revision: 232723
URL: http://svn.freebsd.org/changeset/base/232723

Log:
  Fix a bug reported by Peter Holm which results in a crash:
  Verify in sctp_peeloff() that the socket is a one-to-many
  style SCTP socket.
  
  MFC after: 3 days.

Modified:
  head/sys/netinet/sctp_peeloff.c

Modified: head/sys/netinet/sctp_peeloff.c
==============================================================================
--- head/sys/netinet/sctp_peeloff.c	Fri Mar  9 13:06:24 2012	(r232722)
+++ head/sys/netinet/sctp_peeloff.c	Fri Mar  9 13:12:33 2012	(r232723)
@@ -55,6 +55,15 @@ sctp_can_peel_off(struct socket *head, s
 	struct sctp_tcb *stcb;
 	uint32_t state;
 
+	if (head == NULL) {
+		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EBADF);
+		return (EBADF);
+	}
+	if ((head->so_proto->pr_protocol != IPPROTO_SCTP) ||
+	    (head->so_type != SOCK_SEQPACKET)) {
+		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP);
+		return (EOPNOTSUPP);
+	}
 	inp = (struct sctp_inpcb *)head->so_pcb;
 	if (inp == NULL) {
 		SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);