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Fix bug #1300038 

PANIC: Bad talloc magic value - wrong talloc version used/mixed
This commit is contained in:
Alexander Bokovoy 2016-01-22 12:00:27 +02:00
parent 0b57314e30
commit a3be00049b
2 changed files with 72 additions and 1 deletions
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65
samba-4.3-s3-parm-clean-up-defaults-when-removing-global-param.patch Normal file
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@ -0,0 +1,65 @@
From d8a03eeab8ece3d9001b087fc658272174f92a25 Mon Sep 17 00:00:00 2001
From: Alexander Bokovoy <ab@samba.org>
Date: Fri, 22 Jan 2016 11:44:03 +0200
Subject: [PATCH] s3-parm: clean up defaults when removing global parameters
When globals are re-initialized, they are cleared and globals' talloc
context is freed. However, parm_table still contains a reference to the
global value in the defaults. This confuses lpcfg_string_free() after
commit 795c543d858b2452f062a02846c2f908fe4cffe4 because it tries to
free already freed pointer which is passed by lp_save_defaults():
....
case P_STRING:
case P_USTRING:
lpcfg_string_set(Globals.ctx,
&parm_table[i].def.svalue,
*(char **)lp_parm_ptr(NULL, &parm_table[i]));
....
here &parm_table[i].def.svalue is passed to lpcfg_string_free() but it
is a pointer to a value allocated with previous Globals.ctx which
already was freed.
This specifically affects registry backend of smb.conf in lp_load_ex()
where init_globals() called explicitly to re-init globals after
lp_save_defaults() if we have registry backend defined.
Signed-off-by: Alexander Bokovoy <ab@samba.org>
---
source3/param/loadparm.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/source3/param/loadparm.c b/source3/param/loadparm.c
index 9f4a2b4..f8ecab7 100644
--- a/source3/param/loadparm.c
+++ b/source3/param/loadparm.c
@@ -399,8 +399,25 @@ static void free_parameters_by_snum(int snum)
*/
static void free_global_parameters(void)
{
+ uint32_t i;
+ struct parm_struct *parm;
+
free_param_opts(&Globals.param_opt);
free_parameters_by_snum(GLOBAL_SECTION_SNUM);
+
+ /* Reset references in the defaults because the context is going to be freed */
+ for (i=0; parm_table[i].label; i++) {
+ parm = &parm_table[i];
+ if ((parm->type == P_STRING) ||
+ (parm->type == P_USTRING)) {
+ if ((parm->def.svalue != NULL) &&
+ (*(parm->def.svalue) != '\0')) {
+ if (talloc_parent(parm->def.svalue) == Globals.ctx) {
+ parm->def.svalue = NULL;
+ }
+ }
+ }
+ }
TALLOC_FREE(Globals.ctx);
}
--
2.5.0

8
samba.spec
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@ -6,7 +6,7 @@
# ctdb is enabled by default, you can disable it with: --without clustering
%bcond_without clustering
%define main_release 0
%define main_release 1
%define samba_version 4.3.4
%define talloc_version 2.1.3
@ -107,6 +107,8 @@ Source6: samba.pamd
Source200: README.dc
Source201: README.downgrade
Patch1: samba-4.3-s3-parm-clean-up-defaults-when-removing-global-param.patch
BuildRoot: %(mktemp -ud %{_tmppath}/%{name}-%{version}-%{release}-XXXXXX)
Requires(pre): /usr/sbin/groupadd
@ -670,6 +672,7 @@ and use CTDB instead.
%prep
%setup -q -n samba-%{version}%{pre_release}
%patch1 -p1
%build
%global _talloc_lib ,talloc,pytalloc,pytalloc-util
@ -1978,6 +1981,9 @@ rm -rf %{buildroot}
%endif # with_clustering_support
%changelog
* Fri Jan 22 2016 Alexander Bokovoy <abokovoy@redhat.com> - 4.3.4-1
- resolves: #1300038 - PANIC: Bad talloc magic value - wrong talloc version used/mixed
* Tue Jan 12 2016 Guenther Deschner <gdeschner@redhat.com> - 4.3.4-0
- resolves: #1261230 - Update to Samba 4.3.4