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Fix freelist bug on page split

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NULL out env->pghead before writing it, so that its pages can't be used
to satisfy the write.
This commit is contained in:
Howard Chu 2011-10-03 12:40:53 -07:00
parent 85bfb3c1d1
commit ea0d07ffa3
1 changed files with 4 additions and 3 deletions
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7
libraries/libmdb/mdb.c
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@ -1128,7 +1128,7 @@ mdb_page_alloc(MDB_cursor *mc, int num)
if (pgno == P_INVALID) {
/* DB size is maxed out */
if (txn->mt_next_pgno + num >= txn->mt_env->me_maxpg) {
DPRINTF("DB size maxed out");
DPUTS("DB size maxed out");
return NULL;
}
}
@ -1764,13 +1764,13 @@ mdb_txn_commit(MDB_txn *txn)
MDB_oldpages *mop;
mop = env->me_pghead;
env->me_pghead = NULL;
key.mv_size = sizeof(pgno_t);
key.mv_data = &mop->mo_txnid;
data.mv_size = MDB_IDL_SIZEOF(mop->mo_pages);
data.mv_data = mop->mo_pages;
mdb_cursor_put(&mc, &key, &data, 0);
free(env->me_pghead);
env->me_pghead = NULL;
free(mop);
}
/* Update DB root pointers. Their pages have already been
@ -3202,6 +3202,7 @@ mdb_page_search(MDB_cursor *mc, MDB_val *key, int modify)
}
}
assert(root > 1);
if ((rc = mdb_page_get(mc->mc_txn, root, &mc->mc_pg[0])))
return rc;