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(parent: 94d73f9) | patch
Fix list_copy_head() with empty Lists
authorDavid Rowley <drowley@postgresql.org>
Thu, 20 Apr 2023 22:02:25 +0000 (10:02 +1200)
committerDavid Rowley <drowley@postgresql.org>
Thu, 20 Apr 2023 22:02:25 +0000 (10:02 +1200)
commit63a03aea6bc89060010255e8e61c83f95e1daec8
treea28e3634155ca56856f2fdf7284cf11351415633tree
parent94d73f9abdf13e6dd93d96d0e4b197479c8756decommit | diff
Fix list_copy_head() with empty Lists

list_copy_head() given an empty List would crash from trying to
dereference the List to obtain its length.  Since NIL is how we represent
an empty List, we should just be returning another empty List in this
case.

list_copy_head() is new to v16, so let's fix it now before too many people
start coding around the buggy NIL behavior.

Reported-by: Miroslav Bendik
Discussion: https://postgr.es/m/CAPoEpV02WhawuWnmnKet6BqU63bEu7oec0pJc=nKMtPsHMzTXQ@mail.gmail.com
src/backend/nodes/list.c diff | blob | blame | history
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