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[wallet] Fix leak in CDB constructor

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Now using a std::unique_ptr, the Db instance is correctly released
when CDB initialization fails.
The internal CDB state and mapFileUseCount are only mutated when
the CDB initialization succeeds.
This commit is contained in:
João Barbosa 2017-10-12 23:14:46 +01:00
parent 326a5652e0
commit 7104de8b1f
1 changed files with 16 additions and 18 deletions
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30
src/wallet/db.cpp
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@ -379,45 +379,43 @@ CDB::CDB(CWalletDBWrapper& dbw, const char* pszMode, bool fFlushOnCloseIn) : pdb
if (!env->Open(GetDataDir())) if (!env->Open(GetDataDir()))
throw std::runtime_error("CDB: Failed to open database environment."); throw std::runtime_error("CDB: Failed to open database environment.");
strFile = strFilename; pdb = env->mapDb[strFilename];
++env->mapFileUseCount[strFile];
pdb = env->mapDb[strFile];
if (pdb == nullptr) { if (pdb == nullptr) {
int ret; int ret;
pdb = new Db(env->dbenv, 0); std::unique_ptr<Db> pdb_temp(new Db(env->dbenv, 0));
bool fMockDb = env->IsMock(); bool fMockDb = env->IsMock();
if (fMockDb) { if (fMockDb) {
DbMpoolFile* mpf = pdb->get_mpf(); DbMpoolFile* mpf = pdb_temp->get_mpf();
ret = mpf->set_flags(DB_MPOOL_NOFILE, 1); ret = mpf->set_flags(DB_MPOOL_NOFILE, 1);
if (ret != 0) if (ret != 0) {
throw std::runtime_error(strprintf("CDB: Failed to configure for no temp file backing for database %s", strFile)); throw std::runtime_error(strprintf("CDB: Failed to configure for no temp file backing for database %s", strFilename));
}
} }
ret = pdb->open(nullptr, // Txn pointer ret = pdb_temp->open(nullptr, // Txn pointer
fMockDb ? nullptr : strFile.c_str(), // Filename fMockDb ? nullptr : strFilename.c_str(), // Filename
fMockDb ? strFile.c_str() : "main", // Logical db name fMockDb ? strFilename.c_str() : "main", // Logical db name
DB_BTREE, // Database type DB_BTREE, // Database type
nFlags, // Flags nFlags, // Flags
0); 0);
if (ret != 0) { if (ret != 0) {
delete pdb;
pdb = nullptr;
--env->mapFileUseCount[strFile];
strFile = "";
throw std::runtime_error(strprintf("CDB: Error %d, can't open database %s", ret, strFilename)); throw std::runtime_error(strprintf("CDB: Error %d, can't open database %s", ret, strFilename));
} }
pdb = pdb_temp.release();
env->mapDb[strFilename] = pdb;
if (fCreate && !Exists(std::string("version"))) { if (fCreate && !Exists(std::string("version"))) {
bool fTmp = fReadOnly; bool fTmp = fReadOnly;
fReadOnly = false; fReadOnly = false;
WriteVersion(CLIENT_VERSION); WriteVersion(CLIENT_VERSION);
fReadOnly = fTmp; fReadOnly = fTmp;
} }
env->mapDb[strFile] = pdb;
} }
++env->mapFileUseCount[strFilename];
strFile = strFilename;
} }
} }