Add check in fgetcsv in case sizeof(unit) != sizeof(size_t)

(cherry picked from commit 99ac11222cb2a4e9aa6a865f908b28def349c049)

Conflicts:
	ext/standard/file.c

1 files changed, 6 insertions, 0 deletions

diff --git a/ext/standard/file.c b/ext/standard/file.c
index 5b051774c9..6e17dc5d11 100644
--- a/ext/standard/file.c
+++ b/ext/standard/file.c
@@ -2336,6 +2336,12 @@ PHPAPI void php_fgetcsv(php_stream *stream, char delimiter, char enclosure, char
 
 		/* 3. Now pass our field back to php */
 		*comp_end = '\0';
+#ifndef ZEND_ENABLE_ZVAL_LONG64
+		if (UNEXPECTED((comp_end - temp) > ZEND_LONG_MAX)) {
+			zend_error_noreturn(E_WARNING, "String overflow, max size is " ZEND_LONG_FMT, ZEND_LONG_MAX);
+			break;
+		}
+#endif
 		add_next_index_stringl(return_value, temp, comp_end - temp);
 	} while (inc_len > 0);