>From a9385ea99d15976c5e7585059945f6964f85339c Mon Sep 17 00:00:00 2001 From: Lukas Slebodnik Date: Tue, 25 Mar 2014 17:57:32 +0100 Subject: [PATCH] IPA: Use function sysdb_attrs_get_el in safe way Function sysdb_attrs_get_el can enlarge array of ldb_message_element in "struct sysdb_attrs" if attribute is not among available attributes. Array will be enlarged with function talloc_realloc but realloc can move array to another place in memory therefore ldb_message_element should not be used after next call of function sysdb_attrs_get_el sysdb_attrs_get_el(netgroup, SYSDB_ORIG_MEMBER_USER, &user_found); sysdb_attrs_get_el(netgroup, SYSDB_ORIG_MEMBER_HOST, &host_found); With netgroups, it is common to omit user or host from netgroup triple. There is very high probability that realloc will be called. it is possible pointer user_found can refer to the old area after the second call of function sysdb_attrs_get_el. Resolves: https://fedorahosted.org/sssd/ticket/2284 --- src/providers/ipa/ipa_netgroups.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/src/providers/ipa/ipa_netgroups.c b/src/providers/ipa/ipa_netgroups.c index 49a4ba9ab60a05b31241916cf0a7669c785764d4..9cc374bc17eb53accaf607736a19555e17ebf4e1 100644 --- a/src/providers/ipa/ipa_netgroups.c +++ b/src/providers/ipa/ipa_netgroups.c @@ -297,9 +297,7 @@ static void ipa_get_netgroups_process(struct tevent_req *subreq) struct ipa_get_netgroups_state *state = tevent_req_data(req, struct ipa_get_netgroups_state); int i, ret; - struct ldb_message_element *ng_found; - struct ldb_message_element *host_found; - struct ldb_message_element *user_found; + struct ldb_message_element *el; struct sdap_search_base **netgr_bases; struct sysdb_attrs **netgroups; size_t netgroups_count; @@ -345,16 +343,19 @@ static void ipa_get_netgroups_process(struct tevent_req *subreq) for (i = 0; i < netgroups_count; i++) { ret = sysdb_attrs_get_el(netgroups[i], SYSDB_ORIG_NETGROUP_MEMBER, - &ng_found); + &el); if (ret != EOK) goto done; + if (el->num_values) state->entities_found |= ENTITY_NG; ret = sysdb_attrs_get_el(netgroups[i], SYSDB_ORIG_MEMBER_USER, - &user_found); + &el); if (ret != EOK) goto done; + if (el->num_values) state->entities_found |= ENTITY_USER; ret = sysdb_attrs_get_el(netgroups[i], SYSDB_ORIG_MEMBER_HOST, - &host_found); + &el); if (ret != EOK) goto done; + if (el->num_values) state->entities_found |= ENTITY_HOST; ret = sysdb_attrs_get_string(netgroups[i], SYSDB_ORIG_DN, &orig_dn); if (ret != EOK) { @@ -371,10 +372,6 @@ static void ipa_get_netgroups_process(struct tevent_req *subreq) goto done; } - if (ng_found->num_values) state->entities_found |= ENTITY_NG; - if (user_found->num_values) state->entities_found |= ENTITY_USER; - if (host_found->num_values) state->entities_found |= ENTITY_HOST; - if (state->entities_found == 0) { continue; } -- 1.8.5.3