Index: lib/libkvm/kvm_proc.c
===================================================================
--- lib/libkvm/kvm_proc.c
+++ lib/libkvm/kvm_proc.c
@@ -667,10 +667,12 @@
 	static char **bufp;
 	static int argc;
 
+	buf = NULL;
+
 	if (!ISALIVE(kd)) {
 		_kvm_err(kd, kd->program,
 		    "cannot read user space from dead kernel");
-		return (0);
+		goto failure;
 	}
 
 	if (nchr == 0 || nchr > ARG_MAX)
@@ -679,7 +681,7 @@
 		buf = malloc(nchr);
 		if (buf == NULL) {
 			_kvm_err(kd, kd->program, "cannot allocate memory");
-			return (0);
+			goto failure;
 		}
 		buflen = nchr;
 		argc = 32;
@@ -704,12 +706,11 @@
 		 * to the requested len.
 		 */
 		if (errno != ENOMEM || bufsz != (size_t)buflen)
-			return (0);
+			goto failure;
 		buf[bufsz - 1] = '\0';
 		errno = 0;
-	} else if (bufsz == 0) {
-		return (0);
-	}
+	} else if (bufsz == 0)
+		goto failure;
 	i = 0;
 	p = buf;
 	do {
@@ -717,12 +718,17 @@
 		p += strlen(p) + 1;
 		if (i >= argc) {
 			argc += argc;
-			bufp = realloc(bufp,
+			bufp = reallocf(bufp,
 			    sizeof(char *) * argc);
+			if (bufp == NULL)
+				goto failure;
 		}
 	} while (p < buf + bufsz);
 	bufp[i++] = 0;
 	return (bufp);
+failure:
+	free(buf);
+	return (NULL);
 }
 
 char **