From d8eccb353b1be7f07e74149dde9a41bb199d74e8 Mon Sep 17 00:00:00 2001 From: Howard Chu Date: Mon, 28 Oct 2013 07:25:54 -0700 Subject: [PATCH] ITS#7733 check cursor index before cursor_del --- libraries/liblmdb/mdb.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c index 3ec73024f5..ff4c12441b 100644 --- a/libraries/liblmdb/mdb.c +++ b/libraries/liblmdb/mdb.c @@ -5420,8 +5420,9 @@ mdb_cursor_get(MDB_cursor *mc, MDB_val *key, MDB_val *data, rc = EINVAL; } else { MDB_page *mp = mc->mc_pg[mc->mc_top]; - if (!NUMKEYS(mp)) { - mc->mc_ki[mc->mc_top] = 0; + int nkeys = NUMKEYS(mp); + if (!nkeys || mc->mc_ki[mc->mc_top] >= nkeys) { + mc->mc_ki[mc->mc_top] = nkeys; rc = MDB_NOTFOUND; break; } @@ -6069,6 +6070,7 @@ int mdb_cursor_del(MDB_cursor *mc, unsigned int flags) { MDB_node *leaf; + MDB_page *mp; int rc; if (mc->mc_txn->mt_flags & (MDB_TXN_RDONLY|MDB_TXN_ERROR)) @@ -6077,6 +6079,10 @@ mdb_cursor_del(MDB_cursor *mc, unsigned int flags) if (!(mc->mc_flags & C_INITIALIZED)) return EINVAL; + mp = mc->mc_pg[mc->mc_top]; + if (mc->mc_ki[mc->mc_top] >= NUMKEYS(mp)) + return MDB_NOTFOUND; + if (!(flags & MDB_NOSPILL) && (rc = mdb_page_spill(mc, NULL, NULL))) return rc; @@ -6084,9 +6090,9 @@ mdb_cursor_del(MDB_cursor *mc, unsigned int flags) if (rc) return rc; - leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]); + leaf = NODEPTR(mp, mc->mc_ki[mc->mc_top]); - if (!IS_LEAF2(mc->mc_pg[mc->mc_top]) && F_ISSET(leaf->mn_flags, F_DUPDATA)) { + if (!IS_LEAF2(mp) && F_ISSET(leaf->mn_flags, F_DUPDATA)) { if (!(flags & MDB_NODUPDATA)) { if (!F_ISSET(leaf->mn_flags, F_SUBDATA)) { mc->mc_xcursor->mx_cursor.mc_pg[0] = NODEDATA(leaf); -- 2.39.5