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ITS#8335 LMDB: reject MDB_MULTIPLE put with 0 items

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Also check for overflow of count and size.
This commit is contained in:
Howard Chu 2026-04-27 18:37:15 +01:00
parent 25f9efab91
commit 0ff5b99e40
1 changed files with 9 additions and 0 deletions
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9
libraries/liblmdb/mdb.c
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@ -8505,10 +8505,19 @@ _mdb_cursor_put(MDB_cursor *mc, MDB_val *key, MDB_val *data,
* early failures.
*/
if (flags & MDB_MULTIPLE) {
size_t tmp;
if (!data[1].mv_size)
return EINVAL;
dcount = data[1].mv_size;
data[1].mv_size = 0;
if (!F_ISSET(mc->mc_db->md_flags, MDB_DUPFIXED))
return MDB_INCOMPATIBLE;
/* check for overflow */
tmp = data[0].mv_size * dcount;
if (tmp/dcount != data[0].mv_size)
return MDB_BAD_VALSIZE;
}
nospill = flags & MDB_NOSPILL;