[Python-checkins] gh-132769: Refactor possible read-out-of-bounds in `lexer.c` (#132770)

[pablogsal]

https://github.com/python/cpython/commit/ea8ec95cfadbf58a11ef8e41341254d982a1a479
commit: ea8ec95cfadbf58a11ef8e41341254d982a1a479
branch: main
author: sobolevn <m...@sobolevn.me>
committer: pablogsal <pablog...@gmail.com>
date: 2025-04-21T18:48:48+01:00
summary:

gh-132769: Refactor possible read-out-of-bounds in `lexer.c` (#132770)

files:
M Parser/lexer/lexer.c

diff --git a/Parser/lexer/lexer.c b/Parser/lexer/lexer.c
index 5e68e5d035c545..e81867a5fad015 100644
--- a/Parser/lexer/lexer.c
+++ b/Parser/lexer/lexer.c
@@ -140,7 +140,7 @@ set_fstring_expr(struct tok_state* tok, struct token 
*token, char c) {
         for (i = 0, j = 0; i < input_length; i++) {
             if (tok_mode->last_expr_buffer[i] == '#') {
                 // Skip characters until newline or end of string
-                while (tok_mode->last_expr_buffer[i] != '\0' && i < 
input_length) {
+                while (i < input_length && tok_mode->last_expr_buffer[i] != 
'\0') {
                     if (tok_mode->last_expr_buffer[i] == '\n') {
                         result[j++] = tok_mode->last_expr_buffer[i];
                         break;

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