Miss Islington (bot) 70ecd56113 [3.14] gh-144759: Fix undefined behavior from NULL pointer arithmetic in lexer (GH-144788) (#144834) ... gh-144759: Fix undefined behavior from NULL pointer arithmetic in lexer (GH-144788) 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. (cherry picked from commit e6110efd03) Co-authored-by: Ramin Farajpour Cami <ramin.blackhat@gmail.com>		2026-02-15 15:10:15 +00:00
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buffer.c	[3.14] gh-144759: Fix undefined behavior from NULL pointer arithmetic in lexer (GH-144788) (#144834)	2026-02-15 15:10:15 +00:00
buffer.h	gh-104169: Refactor tokenizer into lexer and wrappers (#110684)	2023-10-11 15:14:44 +00:00
lexer.c	[3.14] gh-140576: Fixed crash produced by lexer in case of dedented zero byte (GH-140583) (#140757)	2025-10-29 13:54:37 +00:00
lexer.h	gh-132661: Implement PEP 750 (#132662)	2025-04-30 11:46:41 +02:00
state.c	gh-132661: Implement PEP 750 (#132662)	2025-04-30 11:46:41 +02:00
state.h	[3.14] gh-139516: Fix lambda colon start format spec in f-string in tokenizer (GH-139657) (#139701)	2025-10-07 18:35:17 +01:00