From: Karel Zak <kzak@redhat.com>
Date: Wed, 10 Sep 2025 08:31:23 +0000 (+0200)
Subject: logger: fix buffer overflow when read stdin
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f9cdc91be0442b887e4a636fbb75f027f0267a84;p=thirdparty%2Futil-linux.git

logger: fix buffer overflow when read stdin

$ perl -e 'print "<" . "0"x10240' | logger --prio-prefix
Segmentation fault (core dumped)

Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/misc-utils/logger.c b/misc-utils/logger.c
index a674ef0cf..d27c8064f 100644
--- a/misc-utils/logger.c
+++ b/misc-utils/logger.c
@@ -1025,7 +1025,9 @@ static void logger_stdin(struct logger_ctl *ctl)
 		if (ctl->prio_prefix && c == '<') {
 			pri = 0;
 			buf[i++] = c;
-			while (isdigit(c = getchar()) && pri <= 191) {
+			while (i < ctl->max_message_size
+			       && isdigit(c = getchar()) && pri <= 191) {
+
 				buf[i++] = c;
 				pri = pri * 10 + c - '0';
 			}