Thread: pgsql: Catch stack overflow when recursing in transformFromClauseItem()

pgsql: Catch stack overflow when recursing in transformFromClauseItem()

From
Tom Lane
Date:
Catch stack overflow when recursing in transformFromClauseItem().

Most parts of the parser can expect that the stack overflow check
in transformExprRecurse() will trigger before things get desperate.
However, transformFromClauseItem() can recurse directly to self
without having analyzed any expressions, so it's possible to drive
it to a stack-overrun crash.  Add a check to prevent that.

Per bug #17583 from Egor Chindyaskin.  Back-patch to all supported
branches.

Richard Guo

Discussion: https://postgr.es/m/17583-33be55b9f981f75c@postgresql.org

Branch
------
REL_12_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/ba516fb0715c75b1b2d393c3de7b99fca6a1ac67

Modified Files
--------------
src/backend/parser/parse_clause.c | 3 +++
1 file changed, 3 insertions(+)