[Pkg-bitcoin-commits] [bitcoin] 79/126: [wallet] Fix leak in CDB constructor
Jonas Smedegaard
dr at jones.dk
Mon Nov 13 20:02:32 UTC 2017
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js pushed a commit to annotated tag debian/0.15.1_dfsg-1
in repository bitcoin.
commit de7053f1141756158c2107bcba376401b4cc94e9
Author: João Barbosa <joao.paulo.barbosa at gmail.com>
Date: Thu Oct 12 23:14:46 2017 +0100
[wallet] Fix leak in CDB constructor
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.
Github-Pull: #11492
Rebased-From: 7104de8b1f3a31d3a60009b5dc376adbedac6a9c
---
src/wallet/db.cpp | 34 ++++++++++++++++------------------
1 file changed, 16 insertions(+), 18 deletions(-)
diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index 8c23d9c..f5f9676 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -379,45 +379,43 @@ CDB::CDB(CWalletDBWrapper& dbw, const char* pszMode, bool fFlushOnCloseIn) : pdb
if (!env->Open(GetDataDir()))
throw std::runtime_error("CDB: Failed to open database environment.");
- strFile = strFilename;
- ++env->mapFileUseCount[strFile];
- pdb = env->mapDb[strFile];
+ pdb = env->mapDb[strFilename];
if (pdb == nullptr) {
int ret;
- pdb = new Db(env->dbenv, 0);
+ std::unique_ptr<Db> pdb_temp(new Db(env->dbenv, 0));
bool fMockDb = env->IsMock();
if (fMockDb) {
- DbMpoolFile* mpf = pdb->get_mpf();
+ DbMpoolFile* mpf = pdb_temp->get_mpf();
ret = mpf->set_flags(DB_MPOOL_NOFILE, 1);
- if (ret != 0)
- throw std::runtime_error(strprintf("CDB: Failed to configure for no temp file backing for database %s", strFile));
+ if (ret != 0) {
+ throw std::runtime_error(strprintf("CDB: Failed to configure for no temp file backing for database %s", strFilename));
+ }
}
- ret = pdb->open(nullptr, // Txn pointer
- fMockDb ? nullptr : strFile.c_str(), // Filename
- fMockDb ? strFile.c_str() : "main", // Logical db name
- DB_BTREE, // Database type
- nFlags, // Flags
+ ret = pdb_temp->open(nullptr, // Txn pointer
+ fMockDb ? nullptr : strFilename.c_str(), // Filename
+ fMockDb ? strFilename.c_str() : "main", // Logical db name
+ DB_BTREE, // Database type
+ nFlags, // Flags
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));
}
+ pdb = pdb_temp.release();
+ env->mapDb[strFilename] = pdb;
+
if (fCreate && !Exists(std::string("version"))) {
bool fTmp = fReadOnly;
fReadOnly = false;
WriteVersion(CLIENT_VERSION);
fReadOnly = fTmp;
}
-
- env->mapDb[strFile] = pdb;
}
+ ++env->mapFileUseCount[strFilename];
+ strFile = strFilename;
}
}
--
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