[PATCH] Fix memleak bug 13362
Jeremy Allison
jra at samba.org
Mon May 14 23:05:52 UTC 2018
On Mon, May 14, 2018 at 08:45:58PM +0200, Volker Lendecke via samba-technical wrote:
> Hi!
>
> Reporter confirmed it fixes the issue. Thanks to Szombathelyi György
> <gyurco at freemail.hu> for the logs and tests.
>
> Review appreciated!
Been following this one in the bug report.
Nice simple fix.
LGTM, RB+ and pushed !
Jeremy
> --
> SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
> phone: +49-551-370000-0, fax: +49-551-370000-9
> AG Göttingen, HRB 2816, GF: Dr. Johannes Loxen
> http://www.sernet.de, mailto:kontakt at sernet.de
> From 2818b6a221776d4d1ab0ee5e880260c22781e1ac Mon Sep 17 00:00:00 2001
> From: Volker Lendecke <vl at samba.org>
> Date: Mon, 7 May 2018 16:41:55 +0200
> Subject: [PATCH 1/2] lib: Put "results_store" into a doubly linked list
>
> Bug: https://bugzilla.samba.org/show_bug.cgi?id=13362
> Signed-off-by: Volker Lendecke <vl at samba.org>
> ---
> lib/ldb/modules/paged_results.c | 25 +++++--------------------
> 1 file changed, 5 insertions(+), 20 deletions(-)
>
> diff --git a/lib/ldb/modules/paged_results.c b/lib/ldb/modules/paged_results.c
> index de014a39699..aafbcbf4483 100644
> --- a/lib/ldb/modules/paged_results.c
> +++ b/lib/ldb/modules/paged_results.c
> @@ -35,6 +35,7 @@
> #include "replace.h"
> #include "system/filesys.h"
> #include "system/time.h"
> +#include "dlinklist.h"
> #include "ldb_module.h"
>
> struct message_store {
> @@ -48,14 +49,13 @@ struct message_store {
> struct private_data;
>
> struct results_store {
> + struct results_store *prev, *next;
>
> struct private_data *priv;
>
> char *cookie;
> time_t timestamp;
>
> - struct results_store *next;
> -
> struct message_store *first;
> struct message_store *last;
> int num_entries;
> @@ -75,22 +75,8 @@ struct private_data {
> static int store_destructor(struct results_store *del)
> {
> struct private_data *priv = del->priv;
> - struct results_store *loop;
> -
> - if (priv->store == del) {
> - priv->store = del->next;
> - return 0;
> - }
> -
> - for (loop = priv->store; loop; loop = loop->next) {
> - if (loop->next == del) {
> - loop->next = del->next;
> - return 0;
> - }
> - }
> -
> - /* is not in list ? */
> - return -1;
> + DLIST_REMOVE(priv->store, del);
> + return 0;
> }
>
> static struct results_store *new_store(struct private_data *priv)
> @@ -120,8 +106,7 @@ static struct results_store *new_store(struct private_data *priv)
> newr->first_ref = NULL;
> newr->controls = NULL;
>
> - newr->next = priv->store;
> - priv->store = newr;
> + DLIST_ADD(priv->store, newr);
>
> talloc_set_destructor(newr, store_destructor);
>
> --
> 2.11.0
>
>
> From 90ebf48be88806ec48c90b860519138a9932617c Mon Sep 17 00:00:00 2001
> From: Volker Lendecke <vl at samba.org>
> Date: Mon, 7 May 2018 16:53:00 +0200
> Subject: [PATCH 2/2] lib: Hold at most 10 outstanding paged result cookies
>
> Bug: https://bugzilla.samba.org/show_bug.cgi?id=13362
> Signed-off-by: Volker Lendecke <vl at samba.org>
> ---
> lib/ldb/modules/paged_results.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/lib/ldb/modules/paged_results.c b/lib/ldb/modules/paged_results.c
> index aafbcbf4483..ecb22271d28 100644
> --- a/lib/ldb/modules/paged_results.c
> +++ b/lib/ldb/modules/paged_results.c
> @@ -36,6 +36,7 @@
> #include "system/filesys.h"
> #include "system/time.h"
> #include "dlinklist.h"
> +#include <assert.h>
> #include "ldb_module.h"
>
> struct message_store {
> @@ -68,6 +69,7 @@ struct results_store {
>
> struct private_data {
> uint32_t next_free_id;
> + size_t num_stores;
> struct results_store *store;
>
> };
> @@ -76,6 +78,10 @@ static int store_destructor(struct results_store *del)
> {
> struct private_data *priv = del->priv;
> DLIST_REMOVE(priv->store, del);
> +
> + assert(priv->num_stores > 0);
> + priv->num_stores -= 1;
> +
> return 0;
> }
>
> @@ -108,8 +114,21 @@ static struct results_store *new_store(struct private_data *priv)
>
> DLIST_ADD(priv->store, newr);
>
> + assert(priv->num_stores < SIZE_MAX);
> + priv->num_stores += 1;
> +
> talloc_set_destructor(newr, store_destructor);
>
> + if (priv->num_stores > 10) {
> + struct results_store *last;
> + /*
> + * 10 is the default for MaxResultSetsPerConn --
> + * possibly need to parameterize it.
> + */
> + last = DLIST_TAIL(priv->store);
> + TALLOC_FREE(last);
> + }
> +
> return newr;
> }
>
> @@ -366,6 +385,8 @@ static int paged_search(struct ldb_module *module, struct ldb_request *req)
> return LDB_ERR_UNWILLING_TO_PERFORM;
> }
>
> + DLIST_PROMOTE(private_data->store, current);
> +
> ac->store = current;
>
> /* check if it is an abandon */
> @@ -397,6 +418,7 @@ static int paged_request_init(struct ldb_module *module)
> }
>
> data->next_free_id = 1;
> + data->num_stores = 0;
> data->store = NULL;
> ldb_module_set_private(module, data);
>
> --
> 2.11.0
>
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