From: Peter Eisentraut <peter_e@gmx.net>
Date: Sat, 23 Nov 2013 12:25:37 +0000 (-0500)
Subject: Avoid potential buffer overflow crash
X-Git-Tag: REL9_4_BETA1~909
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4053189d594a5eb1949bba26766fdb0de837e255;p=postgresql

Avoid potential buffer overflow crash

A pointer to a C string was treated as a pointer to a "name" datum and
passed to SPI_execute_plan().  This pointer would then end up being
passed through datumCopy(), which would try to copy the entire 64 bytes
of name data, thus running past the end of the C string.  Fix by
converting the string to a proper name structure.

Found by LLVM AddressSanitizer.
---

diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 74b573bd5e..dffac7c529 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -632,7 +632,7 @@ pg_get_viewdef_worker(Oid viewoid, int prettyFlags, int wrapColumn)
 	 * Get the pg_rewrite tuple for the view's SELECT rule
 	 */
 	args[0] = ObjectIdGetDatum(viewoid);
-	args[1] = PointerGetDatum(ViewSelectRuleName);
+	args[1] = DirectFunctionCall1(namein, CStringGetDatum(ViewSelectRuleName));
 	nulls[0] = ' ';
 	nulls[1] = ' ';
 	spirc = SPI_execute_plan(plan_getviewrule, args, nulls, true, 2);