D10065.diff
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	Index: head/lib/libkvm/kvm.c
	===================================================================
	--- head/lib/libkvm/kvm.c
	+++ head/lib/libkvm/kvm.c
	@@ -272,6 +272,10 @@
	{
	int error = 0;

	+ if (kd == NULL) {
	+ errno = EINVAL;
	+ return (-1);
	+ }
	if (kd->vmst != NULL)
	kd->arch->ka_freevtop(kd);
	if (kd->pmfd >= 0)
	Index: head/lib/libkvm/kvm_open.3
	===================================================================
	--- head/lib/libkvm/kvm_open.3
	+++ head/lib/libkvm/kvm_open.3
	@@ -32,7 +32,7 @@
	.\" @(#)kvm_open.3 8.3 (Berkeley) 4/19/94
	.\" $FreeBSD$
	.\"
	-.Dd March 19, 2017
	+.Dd March 20, 2017
	.Dt KVM_OPEN 3
	.Os
	.Sh NAME
	@@ -227,10 +227,29 @@
	write the error message into
	.Fa errbuf .
	.Pp
	+.Rv -std kvm_close
	+.Sh ERRORS
	The
	.Fn kvm_close
	-function returns 0 on success and -1 on failure.
	+function may fail and set the global variable
	+.Va errno
	+for any of the errors specified for
	+.Xr close 2 .
	+.Pp
	+The
	+.Fn kvm_close
	+function may also fail and set
	+.Va errno
	+if:
	+.Bl -tag -width Er
	+.It Bq Er EINVAL
	+The value passed via
	+.Fa kd
	+was
	+.Dv NULL .
	+.El
	.Sh SEE ALSO
	+.Xr close 2 ,
	.Xr open 2 ,
	.Xr kvm 3 ,
	.Xr kvm_getargv 3 ,