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patch 9.0.1988: Vim9: potential use-after-free for class members

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Problem:  Vim9: potential use-after-free for class members
Solution: Use the class-related grow array for storing the
          member type instead of using a temporary type
          list grow array

Use the type list grow array associated with the class than using a
temporary type list grow array to allocate the class member type.

For simple types, a predefined type is used. For complex types, the type
is dynamically allocated from a grow array. For class variables, the
type grow array in the class should be used. So that the lifetime of the
type is same as the lifetime of the class.

closes: #13279

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
This commit is contained in:
Yegappan Lakshmanan 2023-10-05 20:24:18 +02:00 committed by Christian Brabandt
parent da5da654de
commit d2f4800099
No known key found for this signature in database
GPG Key ID: F3F92DA383FDDE09
3 changed files with 68 additions and 58 deletions
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109
src/testdir/test_vim9_class.vim
View File

@ -6483,26 +6483,26 @@ func Test_class_variable_complex_type_check()
" script level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
public static Fn: func(list<dict<number>>): dict<list<number>> = Foo
public static Fn: func(list<dict<blob>>): dict<list<blob>> = Foo
endclass
test_garbagecollect_now()
A.Fn = "abc"
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 9)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 9)
" class variable with a specific type. Try assigning a different type at
" class def method level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
public static Fn: func(list<dict<number>>): dict<list<number>> = Foo
public static Fn: func(list<dict<blob>>): dict<list<blob>> = Foo
def Bar()
Fn = "abc"
enddef
@ -6511,17 +6511,17 @@ func Test_class_variable_complex_type_check()
test_garbagecollect_now()
a.Bar()
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 1)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 1)
" class variable with a specific type. Try assigning a different type at
" script def method level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
public static Fn: func(list<dict<number>>): dict<list<number>> = Foo
public static Fn: func(list<dict<blob>>): dict<list<blob>> = Foo
endclass
def Bar()
A.Fn = "abc"
@ -6529,13 +6529,13 @@ func Test_class_variable_complex_type_check()
test_garbagecollect_now()
Bar()
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 1)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 1)
" class variable without any type. Should be set to the initialization
" expression type. Try assigning a different type from script level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6544,13 +6544,13 @@ func Test_class_variable_complex_type_check()
test_garbagecollect_now()
A.Fn = "abc"
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 9)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 9)
" class variable without any type. Should be set to the initialization
" expression type. Try assigning a different type at class def level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6563,13 +6563,13 @@ func Test_class_variable_complex_type_check()
test_garbagecollect_now()
a.Bar()
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 1)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 1)
" class variable without any type. Should be set to the initialization
" expression type. Try assigning a different type at script def level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6581,12 +6581,12 @@ func Test_class_variable_complex_type_check()
test_garbagecollect_now()
Bar()
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 1)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 1)
" class variable with 'any" type. Can be assigned different types.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6594,13 +6594,13 @@ func Test_class_variable_complex_type_check()
public static Fn2: any
endclass
test_garbagecollect_now()
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(A.Fn))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(A.Fn))
A.Fn = "abc"
test_garbagecollect_now()
assert_equal('string', typename(A.Fn))
A.Fn2 = Foo
test_garbagecollect_now()
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(A.Fn2))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(A.Fn2))
A.Fn2 = "xyz"
test_garbagecollect_now()
assert_equal('string', typename(A.Fn2))
@ -6610,7 +6610,7 @@ func Test_class_variable_complex_type_check()
" class variable with 'any" type. Can be assigned different types.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6618,11 +6618,11 @@ func Test_class_variable_complex_type_check()
public static Fn2: any
def Bar()
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(Fn))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(Fn))
Fn = "abc"
assert_equal('string', typename(Fn))
Fn2 = Foo
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(Fn2))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(Fn2))
Fn2 = "xyz"
assert_equal('string', typename(Fn2))
enddef
@ -6639,7 +6639,7 @@ func Test_class_variable_complex_type_check()
" class variable with 'any" type. Can be assigned different types.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6648,11 +6648,11 @@ func Test_class_variable_complex_type_check()
endclass
def Bar()
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(A.Fn))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(A.Fn))
A.Fn = "abc"
assert_equal('string', typename(A.Fn))
A.Fn2 = Foo
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(A.Fn2))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(A.Fn2))
A.Fn2 = "xyz"
assert_equal('string', typename(A.Fn2))
enddef
@ -6662,6 +6662,19 @@ func Test_class_variable_complex_type_check()
Bar()
END
call v9.CheckSourceSuccess(lines)
let lines =<< trim END
vim9script
class A
public static foo = [0z10, 0z20]
endclass
assert_equal([0z10, 0z20], A.foo)
A.foo = [0z30]
assert_equal([0z30], A.foo)
var a = A.foo
assert_equal([0z30], a)
END
call v9.CheckSourceSuccess(lines)
endfunc
" Test type checking for object variable in assignments
@ -6670,27 +6683,27 @@ func Test_object_variable_complex_type_check()
" script level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
public this.Fn: func(list<dict<number>>): dict<list<number>> = Foo
public this.Fn: func(list<dict<blob>>): dict<list<blob>> = Foo
endclass
var a = A.new()
test_garbagecollect_now()
a.Fn = "abc"
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 10)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 10)
" object variable with a specific type. Try assigning a different type at
" object def method level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
public this.Fn: func(list<dict<number>>): dict<list<number>> = Foo
public this.Fn: func(list<dict<blob>>): dict<list<blob>> = Foo
def Bar()
this.Fn = "abc"
this.Fn = Foo
@ -6700,17 +6713,17 @@ func Test_object_variable_complex_type_check()
test_garbagecollect_now()
a.Bar()
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 1)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 1)
" object variable with a specific type. Try assigning a different type at
" script def method level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
public this.Fn: func(list<dict<number>>): dict<list<number>> = Foo
public this.Fn: func(list<dict<blob>>): dict<list<blob>> = Foo
endclass
def Bar()
var a = A.new()
@ -6720,13 +6733,13 @@ func Test_object_variable_complex_type_check()
test_garbagecollect_now()
Bar()
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 2)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 2)
" object variable without any type. Should be set to the initialization
" expression type. Try assigning a different type from script level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6736,13 +6749,13 @@ func Test_object_variable_complex_type_check()
test_garbagecollect_now()
a.Fn = "abc"
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 10)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 10)
" object variable without any type. Should be set to the initialization
" expression type. Try assigning a different type at object def level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6756,13 +6769,13 @@ func Test_object_variable_complex_type_check()
test_garbagecollect_now()
a.Bar()
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 1)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 1)
" object variable without any type. Should be set to the initialization
" expression type. Try assigning a different type at script def level.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6776,12 +6789,12 @@ func Test_object_variable_complex_type_check()
test_garbagecollect_now()
Bar()
END
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<number>>): dict<list<number>> but got string', 2)
call v9.CheckSourceFailure(lines, 'E1012: Type mismatch; expected func(list<dict<blob>>): dict<list<blob>> but got string', 2)
" object variable with 'any" type. Can be assigned different types.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6791,13 +6804,13 @@ func Test_object_variable_complex_type_check()
var a = A.new()
test_garbagecollect_now()
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(a.Fn))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(a.Fn))
a.Fn = "abc"
test_garbagecollect_now()
assert_equal('string', typename(a.Fn))
a.Fn2 = Foo
test_garbagecollect_now()
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(a.Fn2))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(a.Fn2))
a.Fn2 = "xyz"
test_garbagecollect_now()
assert_equal('string', typename(a.Fn2))
@ -6807,7 +6820,7 @@ func Test_object_variable_complex_type_check()
" object variable with 'any" type. Can be assigned different types.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6815,11 +6828,11 @@ func Test_object_variable_complex_type_check()
public this.Fn2: any
def Bar()
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(this.Fn))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(this.Fn))
this.Fn = "abc"
assert_equal('string', typename(this.Fn))
this.Fn2 = Foo
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(this.Fn2))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(this.Fn2))
this.Fn2 = "xyz"
assert_equal('string', typename(this.Fn2))
enddef
@ -6837,7 +6850,7 @@ func Test_object_variable_complex_type_check()
" object variable with 'any" type. Can be assigned different types.
let lines =<< trim END
vim9script
def Foo(l: list<dict<number>>): dict<list<number>>
def Foo(l: list<dict<blob>>): dict<list<blob>>
return {}
enddef
class A
@ -6847,11 +6860,11 @@ func Test_object_variable_complex_type_check()
def Bar()
var a = A.new()
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(a.Fn))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(a.Fn))
a.Fn = "abc"
assert_equal('string', typename(a.Fn))
a.Fn2 = Foo
assert_equal('func(list<dict<number>>): dict<list<number>>', typename(a.Fn2))
assert_equal('func(list<dict<blob>>): dict<list<blob>>', typename(a.Fn2))
a.Fn2 = "xyz"
assert_equal('string', typename(a.Fn2))
enddef

2
src/version.c
View File

@ -704,6 +704,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
1988,
/**/
1987,
/**/

15
src/vim9class.c
View File

@ -1152,12 +1152,8 @@ add_lookup_tables(class_T *cl, class_T *extends_cl, garray_T *objmethods_gap)
* and initialize it.
*/
static void
add_class_members(class_T *cl, exarg_T *eap)
add_class_members(class_T *cl, exarg_T *eap, garray_T *type_list_gap)
{
garray_T type_list;
ga_init2(&type_list, sizeof(type_T *), 10);
// Allocate a typval for each class member and initialize it.
cl->class_members_tv = ALLOC_CLEAR_MULT(typval_T,
cl->class_class_member_count);
@ -1178,8 +1174,9 @@ add_class_members(class_T *cl, exarg_T *eap)
&& etv->v_type != VAR_SPECIAL)
// If the member variable type is not yet set, then use
// the initialization expression type.
m->ocm_type = typval2type(etv, get_copyID(), &type_list,
TVTT_DO_MEMBER|TVTT_MORE_SPECIFIC);
m->ocm_type = typval2type(etv, get_copyID(),
type_list_gap,
TVTT_DO_MEMBER|TVTT_MORE_SPECIFIC);
*tv = *etv;
vim_free(etv);
}
@ -1191,8 +1188,6 @@ add_class_members(class_T *cl, exarg_T *eap)
tv->vval.v_string = NULL;
}
}
clear_type_list(&type_list);
}
/*
@ -1953,7 +1948,7 @@ early_ret:
// Allocate a typval for each class member and initialize it.
if (is_class && cl->class_class_member_count > 0)
add_class_members(cl, eap);
add_class_members(cl, eap, &type_list);
int have_new = FALSE;
ufunc_T *class_func = NULL;