In man(1) mode, properly clean up the resn[] result array

after processing each name given on the command line.

Failure to do so resulted in a memory leak of about 50 kilobytes
per name given on the command line.  Since man(1) uses a few
Megabytes of memory anyway and people rarely give hundreds of names
on the command line, this leak did not cause practical problems,
but cleaning up properly is better in any case.

diff --git a/usr.bin/mandoc/main.c b/usr.bin/mandoc/main.c
index a6c7341..20ff8a6 100644 (file)
--- a/usr.bin/mandoc/main.c
+++ b/usr.bin/mandoc/main.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: main.c,v 1.260 2021/09/04 22:37:26 schwarze Exp $ */
+/* $OpenBSD: main.c,v 1.261 2021/10/04 20:24:00 schwarze Exp $ */
 /*
  * Copyright (c) 2010-2012, 2014-2021 Ingo Schwarze <schwarze@openbsd.org>
  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
@@ -494,6 +494,9 @@ main(int argc, char *argv[])
                                memcpy(res + ressz, resn,
                                    sizeof(*resn) * resnsz);
                                ressz += resnsz;
+                               free(resn);
+                               resn = NULL;
+                               resnsz = 0;
                                continue;
                        }
 
@@ -532,6 +535,10 @@ main(int argc, char *argv[])
                        res = mandoc_reallocarray(res, ressz + 1,
                            sizeof(*res));
                        memcpy(res + ressz++, resn + ib, sizeof(*resn));
+                       memset(resn + ib, 0, sizeof(*resn));
+                       mansearch_free(resn, resnsz);
+                       resn = NULL;
+                       resnsz = 0;
                }
 
        /* apropos(1), whatis(1): Process the full search expression. */