Be more paranoid in ruleutils.c's get_variable().
We were merely Assert'ing that the Var matched the RTE it's supposedly
from. But if the user passes incorrect information to pg_get_expr(),
the RTE might in fact not match; this led either to Assert failures
or core dumps, as reported by Chris Hanks in bug #14220. To fix, just
convert the Asserts to test-and-elog. Adjust an existing test-and-elog
elsewhere in the same function to be consistent in wording.
(If we really felt these were user-facing errors, we might promote them to
ereport's; but I can't convince myself that they're worth translating.)
Back-patch to 9.3; the problematic code doesn't exist before that, and
a quick check says that 9.2 doesn't crash on such cases.
Michael Paquier and Thomas Munro
Report: <20160629224349.1407.32667@wrigleys.postgresql.org>
Branch
------
REL9_4_STABLE
Details
-------
http://git.postgresql.org/pg/commitdiff/b25d87f91d39eb8aff259766141ddd2d2d374b41
Modified Files
--------------
src/backend/utils/adt/ruleutils.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)