From: Christos Zoulas <christos@zoulas.com>
Date: Sat, 8 May 2021 20:07:04 +0000 (-0400)
Subject: Cast isprint(3) argument to unsigned char to avoid undefined behavior.
X-Git-Tag: v3.5.2~19^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e597f8bfee283684e8f9bbdc7a835662d4551144;p=thirdparty%2Flibarchive.git

Cast isprint(3) argument to unsigned char to avoid undefined behavior.
---

diff --git a/libarchive/archive_read_support_format_mtree.c b/libarchive/archive_read_support_format_mtree.c
index 93ba2959a..c5ce01853 100644
--- a/libarchive/archive_read_support_format_mtree.c
+++ b/libarchive/archive_read_support_format_mtree.c
@@ -1074,7 +1074,7 @@ read_mtree(struct archive_read *a, struct mtree *mtree)
 			continue;
 		/* Non-printable characters are not allowed */
 		for (s = p;s < p + len - 1; s++) {
-			if (!isprint(*s)) {
+			if (!isprint((unsigned char)*s)) {
 				r = ARCHIVE_FATAL;
 				break;
 			}