Fix overflow (maybe)

youkidearitai · youkidearitai · commit 4b4f8a0761b8 · 2024-09-25T23:50:36.000+09:00
diff --git a/ext/mbstring/mbstring.c b/ext/mbstring/mbstring.c
@@ -3244,7 +3244,7 @@ PHP_FUNCTION(mb_levenshtein)
 			}
 			if (tmp_wchar_len_2 == 0) {
 				/* Insertion process when there is a surplus of 128 code points. */
-				for (i2 = 0; i2 < tmp_wchar_len_1; i2++) {
+				for (i2 = 0; i2 < tmp_wchar_len_1 && len_2 != 0; i2++) {
 					/* for overflow */
 					if (len_2 < tmp_wchar_len_1) {
 						c0 = p1[i2] + cost_rep;

Original file line number	Diff line number	Diff line change
`@@ -3244,7 +3244,7 @@ PHP_FUNCTION(mb_levenshtein)`
`3244`	`3244`	`}`
`3245`	`3245`	`if (tmp_wchar_len_2 == 0) {`
`3246`	`3246`	`/* Insertion process when there is a surplus of 128 code points. */`
`3247`		`- for (i2 = 0; i2 < tmp_wchar_len_1; i2++) {`
	`3247`	`+ for (i2 = 0; i2 < tmp_wchar_len_1 && len_2 != 0; i2++) {`
`3248`	`3248`	`/* for overflow */`
`3249`	`3249`	`if (len_2 < tmp_wchar_len_1) {`
`3250`	`3250`	`c0 = p1[i2] + cost_rep;`