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wallet: Warn on unexpected EOF while salvaging wallet

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Check for EOF before every getline, and warn when reading gets to EOF
before the end of the data.

Stricter error checking could shed more light on issues such as #7463
and #7379.
This commit is contained in:
Wladimir J. van der Laan 2016-02-15 16:09:13 +01:00
parent bf1e113311
commit ca8fb59ae1
1 changed files with 19 additions and 3 deletions
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22
src/wallet/db.cpp
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@ -165,6 +165,11 @@ CDBEnv::VerifyResult CDBEnv::Verify(const std::string& strFile, bool (*recoverFu
return (fRecovered ? RECOVER_OK : RECOVER_FAIL);
}
/* End of headers, beginning of key/value data */
static const char *HEADER_END = "HEADER=END";
/* End of key/value data */
static const char *DATA_END = "DATA=END";
bool CDBEnv::Salvage(const std::string& strFile, bool fAggressive, std::vector<CDBEnv::KeyValPair>& vResult)
{
LOCK(cs_db);
@ -199,18 +204,29 @@ bool CDBEnv::Salvage(const std::string& strFile, bool fAggressive, std::vector<C
// DATA=END
string strLine;
while (!strDump.eof() && strLine != "HEADER=END")
while (!strDump.eof() && strLine != HEADER_END)
getline(strDump, strLine); // Skip past header
std::string keyHex, valueHex;
while (!strDump.eof() && keyHex != "DATA=END") {
while (!strDump.eof() && keyHex != DATA_END) {
getline(strDump, keyHex);
if (keyHex != "DATA=END") {
if (keyHex != DATA_END) {
if (strDump.eof())
break;
getline(strDump, valueHex);
if (valueHex == DATA_END) {
LogPrintf("CDBEnv::Salvage: WARNING: Number of keys in data does not match number of values.\n");
break;
}
vResult.push_back(make_pair(ParseHex(keyHex), ParseHex(valueHex)));
}
}
if (keyHex != DATA_END) {
LogPrintf("CDBEnv::Salvage: WARNING: Unexpected end of file while reading salvage output.\n");
return false;
}
return (result == 0);
}