Dereferencing the pointer 'parser_token->metadata' with a NULL value

[rialbat]

After having been assigned to a NULL value

cpython/Parser/pegen.c

Line 194 in ac12de2

parser_token->metadata = NULL;

pointer 'parser_token->metadata' is passed as 3rd parameter in call to function 'Py_DECREF':

cpython/Parser/pegen.c

Line 197 in ac12de2

Py_DECREF(parser_token->metadata);

where it is dereferenced.

Metadata for a new_token can be set using fstrings, such as {1!=2=}.
If _PyArena_AddPyObject returns -1, we will get a read access violation exception.

Linked PRs

• gh-131762: Fixed dereferencing the pointer 'parser_token->metadata' with a NULL value #131764
• [3.13] gh-131762: Fixed dereferencing the pointer 'parser_token->metadata' with a NULL value (GH-131764) #131774
• [3.12] gh-131762: Fixed dereferencing the pointer 'parser_token->metadata' with a NULL value (GH-131764) #131775