[Python-checkins] [3.13] gh-132769: Refactor possible read-out-of-bounds in `lexer.c` (GH-132770) (#132788)

[sobolevn]

https://github.com/python/cpython/commit/e140e6ef789b1d8de1afd715503740e96e5ae925
commit: e140e6ef789b1d8de1afd715503740e96e5ae925
branch: 3.13
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: sobolevn <m...@sobolevn.me>
date: 2025-04-21T22:42:55Z
summary:

[3.13] gh-132769: Refactor possible read-out-of-bounds in `lexer.c` (GH-132770) 
(#132788)

gh-132769: Refactor possible read-out-of-bounds in `lexer.c` (GH-132770)
(cherry picked from commit ea8ec95cfadbf58a11ef8e41341254d982a1a479)

Co-authored-by: sobolevn <m...@sobolevn.me>

files:
M Parser/lexer/lexer.c

diff --git a/Parser/lexer/lexer.c b/Parser/lexer/lexer.c
index e4b02aee51d3cf..f7e23596044109 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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