[src/trunk]: src/sys/external/bsd/libnv/dist libnv: fix multiple memory leaks.

[rmind <rmind%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/31e3c369ae6a
branches:  trunk
changeset: 448871:31e3c369ae6a
user:      rmind <rmind%NetBSD.org@localhost>
date:      Tue Feb 12 12:49:23 2019 +0000

description:
libnv: fix multiple memory leaks.

- nvpair_create_stringv: free the temporary string; this fix affects
  nvlist_add_stringf() and nvlist_add_stringv().

- nvpair_remove_nvlist_array (NV_TYPE_NVLIST_ARRAY case): free the chain
  of nvpairs (as resetting it prevents nvlist_destroy() from freeing it).
  Note: freeing the chain in nvlist_destroy() is not sufficient, because
  it would still leak through nvlist_take_nvlist_array().  This affects
  all nvlist_*_nvlist_array() users.

Found by clang/gcc ASAN.  These fixes have been contributed to the
upstream (FreeBSD) repository.

diffstat:

 sys/external/bsd/libnv/dist/nv_impl.h |   3 ++-
 sys/external/bsd/libnv/dist/nvlist.c  |  13 +++++++++++--
 sys/external/bsd/libnv/dist/nvpair.c  |  19 +++++++++++++------
 3 files changed, 26 insertions(+), 9 deletions(-)

diffs (98 lines):

diff -r 6c350399af5a -r 31e3c369ae6a sys/external/bsd/libnv/dist/nv_impl.h
--- a/sys/external/bsd/libnv/dist/nv_impl.h     Tue Feb 12 10:16:58 2019 +0000
+++ b/sys/external/bsd/libnv/dist/nv_impl.h     Tue Feb 12 12:49:23 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: nv_impl.h,v 1.5 2018/09/23 19:07:10 rmind Exp $        */
+/*     $NetBSD: nv_impl.h,v 1.6 2019/02/12 12:49:23 rmind Exp $        */
 
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
@@ -125,6 +125,7 @@
 
 void nvlist_set_parent(nvlist_t *nvl, nvpair_t *parent);
 void nvlist_set_array_next(nvlist_t *nvl, nvpair_t *ele);
+nvpair_t *nvlist_get_array_next_nvpair(nvlist_t *nvl);
 
 const nvpair_t *nvlist_get_nvpair(const nvlist_t *nvl, const char *name);
 
diff -r 6c350399af5a -r 31e3c369ae6a sys/external/bsd/libnv/dist/nvlist.c
--- a/sys/external/bsd/libnv/dist/nvlist.c      Tue Feb 12 10:16:58 2019 +0000
+++ b/sys/external/bsd/libnv/dist/nvlist.c      Tue Feb 12 12:49:23 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: nvlist.c,v 1.6 2018/09/22 17:13:30 rmind Exp $ */
+/*     $NetBSD: nvlist.c,v 1.7 2019/02/12 12:49:23 rmind Exp $ */
 
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
@@ -36,7 +36,7 @@
 #ifdef __FreeBSD__
 __FBSDID("$FreeBSD: head/sys/contrib/libnv/nvlist.c 335347 2018-06-18 22:57:32Z oshogbo $");
 #else
-__RCSID("$NetBSD: nvlist.c,v 1.6 2018/09/22 17:13:30 rmind Exp $");
+__RCSID("$NetBSD: nvlist.c,v 1.7 2019/02/12 12:49:23 rmind Exp $");
 #endif
 
 #include <sys/param.h>
@@ -269,6 +269,15 @@
        nvl->nvl_array_next = ele;
 }
 
+nvpair_t *
+nvlist_get_array_next_nvpair(nvlist_t *nvl)
+{
+
+       NVLIST_ASSERT(nvl);
+
+       return (nvl->nvl_array_next);
+}
+
 bool
 nvlist_in_array(const nvlist_t *nvl)
 {
diff -r 6c350399af5a -r 31e3c369ae6a sys/external/bsd/libnv/dist/nvpair.c
--- a/sys/external/bsd/libnv/dist/nvpair.c      Tue Feb 12 10:16:58 2019 +0000
+++ b/sys/external/bsd/libnv/dist/nvpair.c      Tue Feb 12 12:49:23 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: nvpair.c,v 1.3 2018/09/08 14:32:25 christos Exp $      */
+/*     $NetBSD: nvpair.c,v 1.4 2019/02/12 12:49:23 rmind Exp $ */
 
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
@@ -36,7 +36,7 @@
 #ifdef __FreeBSD__
 __FBSDID("$FreeBSD: head/sys/contrib/libnv/nvpair.c 335382 2018-06-19 18:43:02Z lwhsu $");
 #else
-__RCSID("$NetBSD: nvpair.c,v 1.3 2018/09/08 14:32:25 christos Exp $");
+__RCSID("$NetBSD: nvpair.c,v 1.4 2019/02/12 12:49:23 rmind Exp $");
 #endif
 
 #include <sys/param.h>
@@ -251,8 +251,16 @@
        nvlarray = __DECONST(nvlist_t **,
            nvpair_get_nvlist_array(nvp, &count));
        for (i = 0; i < count; i++) {
-               nvlist_set_array_next(nvlarray[i], NULL);
-               nvlist_set_parent(nvlarray[i], NULL);
+               nvlist_t *nvl;
+               nvpair_t *nnvp;
+
+               nvl = nvlarray[i];
+               nnvp = nvlist_get_array_next_nvpair(nvl);
+               if (nnvp != NULL) {
+                       nvpair_free_structure(nnvp);
+               }
+               nvlist_set_array_next(nvl, NULL);
+               nvlist_set_parent(nvl, NULL);
        }
 }
 
@@ -1216,8 +1224,7 @@
        if (len < 0)
                return (NULL);
        nvp = nvpair_create_string(name, str);
-       if (nvp == NULL)
-               nv_free(str);
+       nv_free(str);
        return (nvp);
 }
 #endif