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patch 9.0.1942: Vim9: execution stack invalidated with null object

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Problem:  Vim9: execution stack invalidated with null object
Solution: Check for a null object before adjusting the execution stack

closes: #13186

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
This commit is contained in:
Yegappan Lakshmanan
2023-09-25 21:00:46 +02:00
committed by Christian Brabandt
parent 54e1f56cf2
commit c1946267f2
2 changed files with 11 additions and 9 deletions
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18
src/vim9execute.c
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@@ -535,6 +535,15 @@ call_dfunc(
// If this is an object method, the object is just before the arguments.
typval_T *obj = STACK_TV_BOT(0) - argcount - vararg_count - 1;
if (IS_OBJECT_METHOD(ufunc) && !IS_CONSTRUCTOR_METHOD(ufunc)
&& obj->v_type == VAR_OBJECT && obj->vval.v_object == NULL)
{
// If this is not a constructor method, then a valid object is
// needed.
emsg(_(e_using_null_object));
return FAIL;
}
// Check the argument types.
if (check_ufunc_arg_types(ufunc, argcount, vararg_count, ectx) == FAIL)
return FAIL;
@@ -601,15 +610,6 @@ call_dfunc(
// the first local variable.
if (IS_OBJECT_METHOD(ufunc))
{
if (obj->v_type == VAR_OBJECT && obj->vval.v_object == NULL
&& !IS_CONSTRUCTOR_METHOD(ufunc))
{
// If this is not a constructor method, then a valid object is
// needed.
emsg(_(e_using_null_object));
return FAIL;
}
*STACK_TV_VAR(0) = *obj;
obj->v_type = VAR_UNKNOWN;
}