From: Christian Brauner <christian.brauner@ubuntu.com>
Date: Mon, 16 Oct 2017 10:22:20 +0000 (+0200)
Subject: log: prevent stack smashing
X-Git-Tag: lxc-2.0.9~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e29179e5919bf33c694614ef99150de46ac8fda5;p=thirdparty%2Flxc.git

log: prevent stack smashing

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---

diff --git a/src/lxc/log.c b/src/lxc/log.c
index e05cbde64..cdff17506 100644
--- a/src/lxc/log.c
+++ b/src/lxc/log.c
@@ -228,7 +228,8 @@ static int log_append_logfile(const struct lxc_log_appender *appender,
 
 	if ((size_t)n < (sizeof(buffer) - 1))
 		n += vsnprintf(buffer + n, sizeof(buffer) - n, event->fmt, *event->vap);
-	else
+
+	if ((size_t)n >= sizeof(buffer))
 		n = sizeof(buffer) - 1;
 
 	buffer[n] = '\n';