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Guard against null arguments in binary_upgrade_create_empty_extension().

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The CHECK_IS_BINARY_UPGRADE macro is not sufficient security protection
if we're going to dereference pass-by-reference arguments before it.

But in any case we really need to explicitly check PG_ARGISNULL for all
the arguments of a non-strict function, not only the ones we expect null
values for.

Oversight in commits 30982be4e5019684e1772dd9170aaa53f5a8e894 and
f92fc4c95ddcc25978354a8248d3df22269201bc.  Found by Andreas Seltenreich.
(The other usages in pg_upgrade_support.c seem safe.)
This commit is contained in:
Tom Lane 2016-01-03 16:26:38 -05:00
parent c6aeba353a
commit 939d10cd87
1 changed files with 16 additions and 4 deletions
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20
src/backend/utils/adt/pg_upgrade_support.c
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@ -129,16 +129,28 @@ binary_upgrade_set_next_pg_authid_oid(PG_FUNCTION_ARGS)
Datum
binary_upgrade_create_empty_extension(PG_FUNCTION_ARGS)
{
text *extName = PG_GETARG_TEXT_PP(0);
text *schemaName = PG_GETARG_TEXT_PP(1);
bool relocatable = PG_GETARG_BOOL(2);
text *extVersion = PG_GETARG_TEXT_PP(3);
text *extName;
text *schemaName;
bool relocatable;
text *extVersion;
Datum extConfig;
Datum extCondition;
List *requiredExtensions;
CHECK_IS_BINARY_UPGRADE;
/* We must check these things before dereferencing the arguments */
if (PG_ARGISNULL(0) ||
PG_ARGISNULL(1) ||
PG_ARGISNULL(2) ||
PG_ARGISNULL(3))
elog(ERROR, "null argument to binary_upgrade_create_empty_extension is not allowed");
extName = PG_GETARG_TEXT_PP(0);
schemaName = PG_GETARG_TEXT_PP(1);
relocatable = PG_GETARG_BOOL(2);
extVersion = PG_GETARG_TEXT_PP(3);
if (PG_ARGISNULL(4))
extConfig = PointerGetDatum(NULL);
else