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authorHaru <haru@dotalux.com>2014-07-19 20:23:35 +0200
committerHaru <haru@dotalux.com>2014-07-19 20:27:58 +0200
commite474973e0a9f057fff212d4f6ba445d189993764 (patch)
treea62c91466e1c8ebce1f57ef7b36fc715ff345a79 /src
parentf62ce0c0bae2c1b674aca5c1d7918ec97d9a7a74 (diff)
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Corrected a dangling pointer in various DBMap/DBIterator functions
- If the DBMap has the DB_RELEASE_DATA option set and it contains a pointer, the optional returned out_data will now have its pointer value set to NULL. - Credits to Ind for discovering the issue. Signed-off-by: Haru <haru@dotalux.com>
Diffstat (limited to 'src')
-rw-r--r--src/common/db.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/src/common/db.c b/src/common/db.c
index cf22d8245..f414ca04d 100644
--- a/src/common/db.c
+++ b/src/common/db.c
@@ -1155,7 +1155,10 @@ static void db_release_data(DBKey key, DBData data, DBRelease which)
{
(void)key;//not used
DB_COUNTSTAT(db_release_data);
- if (which&DB_RELEASE_DATA && data.type == DB_DATA_PTR) aFree(data.u.ptr);
+ if (which&DB_RELEASE_DATA && data.type == DB_DATA_PTR) {
+ aFree(data.u.ptr);
+ data.u.ptr = NULL;
+ }
}
/**
@@ -1174,7 +1177,10 @@ static void db_release_both(DBKey key, DBData data, DBRelease which)
{
DB_COUNTSTAT(db_release_both);
if (which&DB_RELEASE_KEY) aFree((char*)key.str); // needs to be a pointer
- if (which&DB_RELEASE_DATA && data.type == DB_DATA_PTR) aFree(data.u.ptr);
+ if (which&DB_RELEASE_DATA && data.type == DB_DATA_PTR) {
+ aFree(data.u.ptr);
+ data.u.ptr = NULL;
+ }
}
/*****************************************************************************\
@@ -1428,7 +1434,7 @@ bool dbit_obj_exists(DBIterator* self)
* Removes the current entry from the database.
* NOTE: {@link DBIterator#exists} will return false until another entry
* is fetched
- * Puts data of the removed entry in out_data, if out_data is not NULL.
+ * Puts data of the removed entry in out_data, if out_data is not NULL (unless data has been released)
* @param self Iterator
* @param out_data Data of the removed entry.
* @return 1 if entry was removed, 0 otherwise
@@ -1449,10 +1455,10 @@ int dbit_obj_remove(DBIterator* self, DBData *out_data)
DBMap_impl* db = it->db;
if( db->cache == node )
db->cache = NULL;
+ db->release(node->key, node->data, DB_RELEASE_DATA);
if( out_data )
memcpy(out_data, &node->data, sizeof(DBData));
retval = 1;
- db->release(node->key, node->data, DB_RELEASE_DATA);
db_free_add(db, node, &db->ht[it->ht_index]);
}
return retval;
@@ -1840,7 +1846,7 @@ static DBData* db_obj_ensure(DBMap* self, DBKey key, DBCreateData create, ...)
/**
* Put the data identified by the key in the database.
- * Puts the previous data in out_data, if out_data is not NULL.
+ * Puts the previous data in out_data, if out_data is not NULL. (unless data has been released)
* NOTE: Uses the new key, the old one is released.
* @param self Interface of the database
* @param key Key that identifies the data
@@ -1893,9 +1899,9 @@ static int db_obj_put(DBMap* self, DBKey key, DBData data, DBData *out_data)
if (node->deleted) {
db_free_remove(db, node);
} else {
+ db->release(node->key, node->data, DB_RELEASE_BOTH);
if (out_data)
memcpy(out_data, &node->data, sizeof(*out_data));
- db->release(node->key, node->data, DB_RELEASE_BOTH);
retval = 1;
}
break;
@@ -1948,7 +1954,7 @@ static int db_obj_put(DBMap* self, DBKey key, DBData data, DBData *out_data)
/**
* Remove an entry from the database.
- * Puts the previous data in out_data, if out_data is not NULL.
+ * Puts the previous data in out_data, if out_data is not NULL. (unless data has been released)
* NOTE: The key (of the database) is released in {@link #db_free_add(DBMap_impl*,DBNode*,DBNode **)}.
* @param self Interface of the database
* @param key Key that identifies the entry
@@ -1986,10 +1992,10 @@ static int db_obj_remove(DBMap* self, DBKey key, DBData *out_data)
if (!(node->deleted)) {
if (db->cache == node)
db->cache = NULL;
+ db->release(node->key, node->data, DB_RELEASE_DATA);
if (out_data)
memcpy(out_data, &node->data, sizeof(*out_data));
retval = 1;
- db->release(node->key, node->data, DB_RELEASE_DATA);
db_free_add(db, node, &db->ht[hash]);
}
break;