5 files changed, 123 insertions, 118 deletions

diff --git a/net/netlabel/netlabel_cipso_v4.c b/net/netlabel/netlabel_cipso_v4.c
index aaf50032b3a..5c4f60bbc82 100644
--- a/net/netlabel/netlabel_cipso_v4.c
+++ b/net/netlabel/netlabel_cipso_v4.c
@@ -43,6 +43,7 @@
 #include "netlabel_user.h"
 #include "netlabel_cipso_v4.h"
 #include "netlabel_mgmt.h"
+#include "netlabel_domainhash.h"
 
 /* Argument struct for cipso_v4_doi_walk() */
 struct netlbl_cipsov4_doiwalk_arg {
@@ -51,6 +52,12 @@ struct netlbl_cipsov4_doiwalk_arg {
         u32 seq;
 };
 
+/* Argument struct for netlbl_domhsh_walk() */
+struct netlbl_domhsh_walk_arg {
+        struct netlbl_audit *audit_info;
+        u32 doi;
+};
+
 /* NetLabel Generic NETLINK CIPSOv4 family */
 static struct genl_family netlbl_cipsov4_gnl_family = {
         .id = GENL_ID_GENERATE,
@@ -81,32 +88,6 @@ static const struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1
  */
 
 /**
- * netlbl_cipsov4_doi_free - Frees a CIPSO V4 DOI definition
- * @entry: the entry's RCU field
- *
- * Description:
- * This function is designed to be used as a callback to the call_rcu()
- * function so that the memory allocated to the DOI definition can be released
- * safely.
- *
- */
-void netlbl_cipsov4_doi_free(struct rcu_head *entry)
-{
-        struct cipso_v4_doi *ptr;
-
-        ptr = container_of(entry, struct cipso_v4_doi, rcu);
-        switch (ptr->type) {
-        case CIPSO_V4_MAP_STD:
-                kfree(ptr->map.std->lvl.cipso);
-                kfree(ptr->map.std->lvl.local);
-                kfree(ptr->map.std->cat.cipso);
-                kfree(ptr->map.std->cat.local);
-                break;
-        }
-        kfree(ptr);
-}
-
-/**
  * netlbl_cipsov4_add_common - Parse the common sections of a ADD message
  * @info: the Generic NETLINK info block
  * @doi_def: the CIPSO V4 DOI definition
@@ -342,7 +323,7 @@ static int netlbl_cipsov4_add_std(struct genl_info *info)
 
 add_std_failure:
         if (doi_def)
-                netlbl_cipsov4_doi_free(&doi_def->rcu);
+                cipso_v4_doi_free(doi_def);
         return ret_val;
 }
 
@@ -379,7 +360,7 @@ static int netlbl_cipsov4_add_pass(struct genl_info *info)
         return 0;
 
 add_pass_failure:
-        netlbl_cipsov4_doi_free(&doi_def->rcu);
+        cipso_v4_doi_free(doi_def);
         return ret_val;
 }
 
@@ -668,6 +649,29 @@ static int netlbl_cipsov4_listall(struct sk_buff *skb,
 }
 
 /**
+ * netlbl_cipsov4_remove_cb - netlbl_cipsov4_remove() callback for REMOVE
+ * @entry: LSM domain mapping entry
+ * @arg: the netlbl_domhsh_walk_arg structure
+ *
+ * Description:
+ * This function is intended for use by netlbl_cipsov4_remove() as the callback
+ * for the netlbl_domhsh_walk() function; it removes LSM domain map entries
+ * which are associated with the CIPSO DOI specified in @arg.  Returns zero on
+ * success, negative values on failure.
+ *
+ */
+static int netlbl_cipsov4_remove_cb(struct netlbl_dom_map *entry, void *arg)
+{
+        struct netlbl_domhsh_walk_arg *cb_arg = arg;
+
+        if (entry->type == NETLBL_NLTYPE_CIPSOV4 &&
+            entry->type_def.cipsov4->doi == cb_arg->doi)
+                return netlbl_domhsh_remove_entry(entry, cb_arg->audit_info);
+
+        return 0;
+}
+
+/**
  * netlbl_cipsov4_remove - Handle a REMOVE message
  * @skb: the NETLINK buffer
  * @info: the Generic NETLINK info block
@@ -681,8 +685,11 @@ static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
 {
         int ret_val = -EINVAL;
         u32 doi = 0;
+        struct netlbl_domhsh_walk_arg cb_arg;
         struct audit_buffer *audit_buf;
         struct netlbl_audit audit_info;
+        u32 skip_bkt = 0;
+        u32 skip_chain = 0;
 
         if (!info->attrs[NLBL_CIPSOV4_A_DOI])
                 return -EINVAL;
@@ -690,11 +697,15 @@ static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
         doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]);
         netlbl_netlink_auditinfo(skb, &audit_info);
 
-        ret_val = cipso_v4_doi_remove(doi,
-                                      &audit_info,
-                                      netlbl_cipsov4_doi_free);
-        if (ret_val == 0)
-                atomic_dec(&netlabel_mgmt_protocount);
+        cb_arg.doi = doi;
+        cb_arg.audit_info = &audit_info;
+        ret_val = netlbl_domhsh_walk(&skip_bkt, &skip_chain,
+                                     netlbl_cipsov4_remove_cb, &cb_arg);
+        if (ret_val == 0 || ret_val == -ENOENT) {
+                ret_val = cipso_v4_doi_remove(doi, &audit_info);
+                if (ret_val == 0)
+                        atomic_dec(&netlabel_mgmt_protocount);
+        }
 
         audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL,
                                               &audit_info);
diff --git a/net/netlabel/netlabel_domainhash.c b/net/netlabel/netlabel_domainhash.c
index dc42206c431..0243f0c57b4 100644
--- a/net/netlabel/netlabel_domainhash.c
+++ b/net/netlabel/netlabel_domainhash.c
@@ -217,20 +217,6 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry,
         u32 bkt;
         struct audit_buffer *audit_buf;
 
-        switch (entry->type) {
-        case NETLBL_NLTYPE_UNLABELED:
-                ret_val = 0;
-                break;
-        case NETLBL_NLTYPE_CIPSOV4:
-                ret_val = cipso_v4_doi_domhsh_add(entry->type_def.cipsov4,
-                                                  entry->domain);
-                break;
-        default:
-                return -EINVAL;
-        }
-        if (ret_val != 0)
-                return ret_val;
-
         entry->valid = 1;
         INIT_RCU_HEAD(&entry->rcu);
 
@@ -271,16 +257,6 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry,
         }
         rcu_read_unlock();
 
-        if (ret_val != 0) {
-                switch (entry->type) {
-                case NETLBL_NLTYPE_CIPSOV4:
-                        if (cipso_v4_doi_domhsh_remove(entry->type_def.cipsov4,
-                                                       entry->domain) != 0)
-                                BUG();
-                        break;
-                }
-        }
-
         return ret_val;
 }
 
@@ -302,35 +278,26 @@ int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
 }
 
 /**
- * netlbl_domhsh_remove - Removes an entry from the domain hash table
- * @domain: the domain to remove
+ * netlbl_domhsh_remove_entry - Removes a given entry from the domain table
+ * @entry: the entry to remove
  * @audit_info: NetLabel audit information
  *
  * Description:
  * Removes an entry from the domain hash table and handles any updates to the
- * lower level protocol handler (i.e. CIPSO).  Returns zero on success,
- * negative on failure.
+ * lower level protocol handler (i.e. CIPSO).  Caller is responsible for
+ * ensuring that the RCU read lock is held.  Returns zero on success, negative
+ * on failure.
  *
  */
-int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
+int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
+                               struct netlbl_audit *audit_info)
 {
-        int ret_val = -ENOENT;
-        struct netlbl_dom_map *entry;
+        int ret_val = 0;
         struct audit_buffer *audit_buf;
 
-        rcu_read_lock();
-        if (domain)
-                entry = netlbl_domhsh_search(domain);
-        else
-                entry = netlbl_domhsh_search_def(domain);
         if (entry == NULL)
-                goto remove_return;
-        switch (entry->type) {
-        case NETLBL_NLTYPE_CIPSOV4:
-                cipso_v4_doi_domhsh_remove(entry->type_def.cipsov4,
-                                           entry->domain);
-                break;
-        }
+                return -ENOENT;
+
         spin_lock(&netlbl_domhsh_lock);
         if (entry->valid) {
                 entry->valid = 0;
@@ -338,8 +305,8 @@ int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
                         list_del_rcu(&entry->list);
                 else
                         rcu_assign_pointer(netlbl_domhsh_def, NULL);
-                ret_val = 0;
-        }
+        } else
+                ret_val = -ENOENT;
         spin_unlock(&netlbl_domhsh_lock);
 
         audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
@@ -351,10 +318,42 @@ int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
                 audit_log_end(audit_buf);
         }
 
-remove_return:
-        rcu_read_unlock();
-        if (ret_val == 0)
+        if (ret_val == 0) {
+                switch (entry->type) {
+                case NETLBL_NLTYPE_CIPSOV4:
+                        cipso_v4_doi_putdef(entry->type_def.cipsov4);
+                        break;
+                }
                 call_rcu(&entry->rcu, netlbl_domhsh_free_entry);
+        }
+
+        return ret_val;
+}
+
+/**
+ * netlbl_domhsh_remove - Removes an entry from the domain hash table
+ * @domain: the domain to remove
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Removes an entry from the domain hash table and handles any updates to the
+ * lower level protocol handler (i.e. CIPSO).  Returns zero on success,
+ * negative on failure.
+ *
+ */
+int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
+{
+        int ret_val;
+        struct netlbl_dom_map *entry;
+
+        rcu_read_lock();
+        if (domain)
+                entry = netlbl_domhsh_search(domain);
+        else
+                entry = netlbl_domhsh_search_def(domain);
+        ret_val = netlbl_domhsh_remove_entry(entry, audit_info);
+        rcu_read_unlock();
+
         return ret_val;
 }
 
diff --git a/net/netlabel/netlabel_domainhash.h b/net/netlabel/netlabel_domainhash.h
index 8220990ceb9..afcc41a7432 100644
--- a/net/netlabel/netlabel_domainhash.h
+++ b/net/netlabel/netlabel_domainhash.h
@@ -61,6 +61,8 @@ int netlbl_domhsh_add(struct netlbl_dom_map *entry,
                       struct netlbl_audit *audit_info);
 int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
                               struct netlbl_audit *audit_info);
+int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
+                               struct netlbl_audit *audit_info);
 int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info);
 int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info);
 struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain);
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index 22faba620e4..7d8ecea9391 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -121,10 +121,15 @@ int netlbl_cfg_cipsov4_add_map(struct cipso_v4_doi *doi_def,
                                struct netlbl_audit *audit_info)
 {
         int ret_val = -ENOMEM;
+        u32 doi;
+        u32 doi_type;
         struct netlbl_dom_map *entry;
         const char *type_str;
         struct audit_buffer *audit_buf;
 
+        doi = doi_def->doi;
+        doi_type = doi_def->type;
+
         entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
         if (entry == NULL)
                 return -ENOMEM;
@@ -133,32 +138,25 @@ int netlbl_cfg_cipsov4_add_map(struct cipso_v4_doi *doi_def,
                 if (entry->domain == NULL)
                         goto cfg_cipsov4_add_map_failure;
         }
-        entry->type = NETLBL_NLTYPE_CIPSOV4;
-        entry->type_def.cipsov4 = doi_def;
-
-        /* Grab a RCU read lock here so nothing happens to the doi_def variable
-         * between adding it to the CIPSOv4 protocol engine and adding a
-         * domain mapping for it. */
 
-        rcu_read_lock();
         ret_val = cipso_v4_doi_add(doi_def);
         if (ret_val != 0)
-                goto cfg_cipsov4_add_map_failure_unlock;
+                goto cfg_cipsov4_add_map_failure_remove_doi;
+        entry->type = NETLBL_NLTYPE_CIPSOV4;
+        entry->type_def.cipsov4 = cipso_v4_doi_getdef(doi);
+        if (entry->type_def.cipsov4 == NULL) {
+                ret_val = -ENOENT;
+                goto cfg_cipsov4_add_map_failure_remove_doi;
+        }
         ret_val = netlbl_domhsh_add(entry, audit_info);
         if (ret_val != 0)
-                goto cfg_cipsov4_add_map_failure_remove_doi;
-        rcu_read_unlock();
-
-        return 0;
+                goto cfg_cipsov4_add_map_failure_release_doi;
 
-cfg_cipsov4_add_map_failure_remove_doi:
-        cipso_v4_doi_remove(doi_def->doi, audit_info, netlbl_cipsov4_doi_free);
-cfg_cipsov4_add_map_failure_unlock:
-        rcu_read_unlock();
+cfg_cipsov4_add_map_return:
         audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD,
                                               audit_info);
         if (audit_buf != NULL) {
-                switch (doi_def->type) {
+                switch (doi_type) {
                 case CIPSO_V4_MAP_STD:
                         type_str = "std";
                         break;
@@ -170,14 +168,21 @@ cfg_cipsov4_add_map_failure_unlock:
                 }
                 audit_log_format(audit_buf,
                                  " cipso_doi=%u cipso_type=%s res=%u",
-                                 doi_def->doi, type_str, ret_val == 0 ? 1 : 0);
+                                 doi, type_str, ret_val == 0 ? 1 : 0);
                 audit_log_end(audit_buf);
         }
+
+        return ret_val;
+
+cfg_cipsov4_add_map_failure_release_doi:
+        cipso_v4_doi_putdef(doi_def);
+cfg_cipsov4_add_map_failure_remove_doi:
+        cipso_v4_doi_remove(doi, audit_info);
 cfg_cipsov4_add_map_failure:
         if (entry != NULL)
                 kfree(entry->domain);
         kfree(entry);
-        return ret_val;
+        goto cfg_cipsov4_add_map_return;
 }
 
 /*
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
index 44be5d5261f..c4e18c7bc0c 100644
--- a/net/netlabel/netlabel_mgmt.c
+++ b/net/netlabel/netlabel_mgmt.c
@@ -122,18 +122,12 @@ static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
                         goto add_failure;
 
                 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
-                /* We should be holding a rcu_read_lock() here while we hold
-                 * the result but since the entry will always be deleted when
-                 * the CIPSO DOI is deleted we aren't going to keep the
-                 * lock. */
-                rcu_read_lock();
                 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
-                if (entry->type_def.cipsov4 == NULL) {
-                        rcu_read_unlock();
+                if (entry->type_def.cipsov4 == NULL)
                         goto add_failure;
-                }
                 ret_val = netlbl_domhsh_add(entry, &audit_info);
-                rcu_read_unlock();
+                if (ret_val != 0)
+                        cipso_v4_doi_putdef(entry->type_def.cipsov4);
                 break;
         default:
                 goto add_failure;
@@ -294,18 +288,12 @@ static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
                         goto adddef_failure;
 
                 tmp_val = nla_get_u32(info->attrs[NLBL_MGMT_A_CV4DOI]);
-                /* We should be holding a rcu_read_lock() here while we hold
-                 * the result but since the entry will always be deleted when
-                 * the CIPSO DOI is deleted we aren't going to keep the
-                 * lock. */
-                rcu_read_lock();
                 entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
-                if (entry->type_def.cipsov4 == NULL) {
-                        rcu_read_unlock();
+                if (entry->type_def.cipsov4 == NULL)
                         goto adddef_failure;
-                }
                 ret_val = netlbl_domhsh_add_default(entry, &audit_info);
-                rcu_read_unlock();
+                if (ret_val != 0)
+                        cipso_v4_doi_putdef(entry->type_def.cipsov4);
                 break;
         default:
                 goto adddef_failure;