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Workaround VL32 cursor refcounting miscount 

Don't try to deref cursor page if txn's pagelist is empty
This commit is contained in:
Howard Chu 2017-01-31 10:38:12 +00:00
parent 15eb2bcf6f
commit edfd7f6e07
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GPG Key ID: FD2A70B44AB11BA7
1 changed files with 9 additions and 7 deletions
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2
external/db_drivers/liblmdb/mdb.c vendored
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@ -1953,6 +1953,7 @@ static void
mdb_cursor_unref(MDB_cursor *mc) mdb_cursor_unref(MDB_cursor *mc)
{ {
int i; int i;
if (mc->mc_txn->mt_rpages[0].mid) {
if (!mc->mc_snum || !mc->mc_pg[0] || IS_SUBP(mc->mc_pg[0])) if (!mc->mc_snum || !mc->mc_pg[0] || IS_SUBP(mc->mc_pg[0]))
return; return;
for (i=0; i<mc->mc_snum; i++) for (i=0; i<mc->mc_snum; i++)
@ -1961,6 +1962,7 @@ mdb_cursor_unref(MDB_cursor *mc)
mdb_page_unref(mc->mc_txn, mc->mc_ovpg); mdb_page_unref(mc->mc_txn, mc->mc_ovpg);
mc->mc_ovpg = 0; mc->mc_ovpg = 0;
} }
}
mc->mc_snum = mc->mc_top = 0; mc->mc_snum = mc->mc_top = 0;
mc->mc_pg[0] = NULL; mc->mc_pg[0] = NULL;
mc->mc_flags &= ~C_INITIALIZED; mc->mc_flags &= ~C_INITIALIZED;