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mdbx: check for txnid overflow (paranoia).

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Change-Id: Id7cd62abf8605150ff5491fb1129383e3e748603
This commit is contained in:
Leo Yuriev 2017-04-27 01:27:41 +03:00
parent 9e07b71c27
commit fd078ee163
1 changed files with 7 additions and 0 deletions
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7
src/mdbx.c
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@ -2213,6 +2213,12 @@ static int mdbx_txn_renew0(MDB_txn *txn, unsigned flags) {
MDB_meta *meta = mdbx_meta_head(env);
txn->mt_canary = meta->mm_canary;
txn->mt_txnid = meta->mm_txnid + 1;
if (unlikely(txn->mt_txnid < meta->mm_txnid)) {
mdbx_debug("txnid overflow!");
rc = MDB_TXN_FULL;
goto bailout;
}
txn->mt_flags = flags;
#if MDB_DEBUG
@ -2262,6 +2268,7 @@ static int mdbx_txn_renew0(MDB_txn *txn, unsigned flags) {
} else {
return MDB_SUCCESS;
}
bailout:
assert(rc != MDB_SUCCESS);
mdbx_txn_end(txn, MDB_END_SLOT | MDB_END_FAIL_BEGIN);
return rc;