Fix possible overflow when converting, possible negative number to uint16. postingoff can be -1,when converts to uint16, overflow can raise. Otherwise, truncation can be occurs, losing precision, from int (31 bits) to uint16 (15 bits) There is a little confusion in the parameters of some functions in this file, postigoff is declared as int, other declared as uint16.
src/backend/access/nbtree/nbtinsert.c static void _bt_insertonpg(Relation rel, BTScanInsert itup_key, Buffer buf, Buffer cbuf, BTStack stack, IndexTuple itup, Size itemsz, OffsetNumber newitemoff, int postingoff, // INT bool split_only_page); static Buffer _bt_split(Relation rel, BTScanInsert itup_key, Buffer buf, Buffer cbuf, OffsetNumber newitemoff, Size newitemsz, IndexTuple newitem, IndexTuple orignewitem, IndexTuple nposting, uint16 postingoff); // UINT16 regards, Ranier Vilela
fix_possible_overflow_postingoff.patch
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