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r21563: Fix a memleak: We only need dispinfo structs for "our" and for the builtin

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domain. Without this patch we leaked a DISPINFO for the (NULL) domain per
samr_connect*() call.

Volker
This commit is contained in:
Volker Lendecke 2007-02-27 17:21:21 +00:00 committed by Gerald (Jerry) Carter
parent 952f648d81
commit 4423880ff4
1 changed files with 43 additions and 42 deletions
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85
source/rpc_server/srv_samr_nt.c
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@ -46,8 +46,6 @@
#define DISP_INFO_CACHE_TIMEOUT 10
typedef struct disp_info {
struct disp_info *next, *prev;
TALLOC_CTX *mem_ctx;
DOM_SID sid; /* identify which domain this is. */
BOOL builtin_domain; /* Quick flag to check if this is the builtin domain. */
struct pdb_search *users; /* querydispinfo 1 and 4 */
@ -65,8 +63,6 @@ typedef struct disp_info {
/* We keep a static list of these by SID as modern clients close down
all resources between each request in a complete enumeration. */
static DISP_INFO *disp_info_list;
struct samr_info {
/* for use by the \PIPE\samr policy */
DOM_SID sid;
@ -254,49 +250,59 @@ static NTSTATUS access_check_samr_function(uint32 acc_granted, uint32 acc_requir
Fetch or create a dispinfo struct.
********************************************************************/
static DISP_INFO *get_samr_dispinfo_by_sid(DOM_SID *psid, const char *sid_str)
static DISP_INFO *get_samr_dispinfo_by_sid(DOM_SID *psid)
{
TALLOC_CTX *mem_ctx;
DISP_INFO *dpi;
/*
* We do a static cache for DISP_INFO's here. Explanation can be found
* in Jeremy's checkin message to r11793:
*
* Fix the SAMR cache so it works across completely insane
* client behaviour (ie.:
* open pipe/open SAMR handle/enumerate 0 - 1024
* close SAMR handle, close pipe.
* open pipe/open SAMR handle/enumerate 1024 - 2048...
* close SAMR handle, close pipe.
* And on ad-nausium. Amazing.... probably object-oriented
* client side programming in action yet again.
* This change should *massively* improve performance when
* enumerating users from an LDAP database.
* Jeremy.
*
* "Our" and the builtin domain are the only ones where we ever
* enumerate stuff, so just cache 2 entries.
*/
static struct disp_info builtin_dispinfo;
static struct disp_info domain_dispinfo;
/* There are two cases to consider here:
1) The SID is a domain SID and we look for an equality match, or
2) This is an account SID and so we return the DISP_INFO* for our
domain */
if ( psid && sid_check_is_in_our_domain( psid ) ) {
DEBUG(10,("get_samr_dispinfo_by_sid: Replacing %s with our domain SID\n",
sid_str));
psid = get_global_sam_sid();
}
for (dpi = disp_info_list; dpi; dpi = dpi->next) {
if (sid_equal(psid, &dpi->sid)) {
return dpi;
}
}
/* This struct is never free'd - I'm using talloc so we
can get a list out of smbd using smbcontrol. There will
be one of these per SID we're authorative for. JRA. */
mem_ctx = talloc_init("DISP_INFO for domain sid %s", sid_str);
if ((dpi = TALLOC_ZERO_P(mem_ctx, DISP_INFO)) == NULL)
if (psid == NULL) {
return NULL;
dpi->mem_ctx = mem_ctx;
if (psid) {
sid_copy( &dpi->sid, psid);
dpi->builtin_domain = sid_check_is_builtin(psid);
} else {
dpi->builtin_domain = False;
}
DLIST_ADD(disp_info_list, dpi);
if (sid_check_is_builtin(psid) || sid_check_is_in_builtin(psid)) {
/*
* Necessary only once, but it does not really hurt.
*/
sid_copy(&builtin_dispinfo.sid, &global_sid_Builtin);
return dpi;
return &builtin_dispinfo;
}
if (sid_check_is_domain(psid) || sid_check_is_in_our_domain(psid)) {
/*
* Necessary only once, but it does not really hurt.
*/
sid_copy(&domain_dispinfo.sid, get_global_sam_sid());
return &domain_dispinfo;
}
return NULL;
}
/*******************************************************************
@ -330,12 +336,7 @@ static struct samr_info *get_samr_info_by_sid(DOM_SID *psid)
}
info->mem_ctx = mem_ctx;
info->disp_info = get_samr_dispinfo_by_sid(psid, sid_str);
if (!info->disp_info) {
talloc_destroy(mem_ctx);
return NULL;
}
info->disp_info = get_samr_dispinfo_by_sid(psid);
return info;
}