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e6110efd03
Guard against NULL pointer arithmetic in `_PyLexer_remember_fstring_buffers` and `_PyLexer_restore_fstring_buffers`. When `start` or `multi_line_start` are NULL (uninitialized in tok_mode_stack[0]), performing `NULL - tok->buf` is undefined behavior. Add explicit NULL checks to store -1 as sentinel and restore NULL accordingly. Add test_lexer_buffer_realloc_with_null_start to test_repl.py that exercises the code path where the lexer buffer is reallocated while tok_mode_stack[0] has NULL start/multi_line_start pointers. This triggers _PyLexer_remember_fstring_buffers and verifies the NULL checks prevent undefined behavior. |
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| .. | ||
| lexer | ||
| tokenizer | ||
| action_helpers.c | ||
| asdl.py | ||
| asdl_c.py | ||
| myreadline.c | ||
| parser.c | ||
| peg_api.c | ||
| pegen.c | ||
| pegen.h | ||
| pegen_errors.c | ||
| Python.asdl | ||
| string_parser.c | ||
| string_parser.h | ||
| token.c | ||