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-rw-r--r--Lib/test/test_str.py4
-rw-r--r--Lib/test/test_unicode.py4
-rw-r--r--Misc/NEWS3
-rw-r--r--Objects/stringlib/string_format.h5
4 files changed, 14 insertions, 2 deletions
diff --git a/Lib/test/test_str.py b/Lib/test/test_str.py
index 044711c..de988a8 100644
--- a/Lib/test/test_str.py
+++ b/Lib/test/test_str.py
@@ -351,6 +351,10 @@ class StrTest(
self.assertRaises(ValueError, "{:s}".format)
self.assertRaises(ValueError, "{}".format)
+ # issue 6089
+ self.assertRaises(ValueError, "{0[0]x}".format, [None])
+ self.assertRaises(ValueError, "{0[0](10)}".format, [None])
+
# can't have a replacement on the field name portion
self.assertRaises(TypeError, '{0[{1}]}'.format, 'abcdefg', 4)
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 968f64b..96c15f0 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -1091,6 +1091,10 @@ class UnicodeTest(
self.assertRaises(ValueError, u"{:s}".format)
self.assertRaises(ValueError, u"{}".format)
+ # issue 6089
+ self.assertRaises(ValueError, u"{0[0]x}".format, [None])
+ self.assertRaises(ValueError, u"{0[0](10)}".format, [None])
+
# can't have a replacement on the field name portion
self.assertRaises(TypeError, u'{0[{1}]}'.format, u'abcdefg', 4)
diff --git a/Misc/NEWS b/Misc/NEWS
index 61717a0..2b1630f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@ What's New in Python 2.6.3
Core and Builtins
-----------------
+- Issue #6089: str.format can raise SystemError with certain invalid
+ field specifiers.
+
- Issue #5994: the marshal module now has docstrings.
- Issue #5981: Fix two minor inf/nan issues in float.fromhex: (1) inf
diff --git a/Objects/stringlib/string_format.h b/Objects/stringlib/string_format.h
index 600e6b0..6c531e8 100644
--- a/Objects/stringlib/string_format.h
+++ b/Objects/stringlib/string_format.h
@@ -329,8 +329,9 @@ FieldNameIterator_next(FieldNameIterator *self, int *is_attribute,
*name_idx = get_integer(name);
break;
default:
- /* interal error, can't get here */
- assert(0);
+ /* Invalid character follows ']' */
+ PyErr_SetString(PyExc_ValueError, "Only '.' or '[' may "
+ "follow ']' in format field specifier");
return 0;
}