From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Wed, 14 Aug 2024 15:40:40 +0000 (+0200)
Subject: depmod: Fix out of boundary write with long paths
X-Git-Tag: v34~516
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8116f06614886209a66ad421125191c03f94f478;p=thirdparty%2Fkmod.git

depmod: Fix out of boundary write with long paths

If a root path is specified which is PATH_MAX - 1 characters long
and option -A is specified, then depfile_up_to_date_dir triggers
an out of boundary write during slash addition.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>
---

diff --git a/tools/depmod.c b/tools/depmod.c
index bd9df207..78ab2076 100644
--- a/tools/depmod.c
+++ b/tools/depmod.c
@@ -2855,7 +2855,7 @@ static int depfile_up_to_date_dir(DIR *d, time_t mtime, size_t baselen, char *pa
 /* uptodate: 1, outdated: 0, errors < 0 */
 static int depfile_up_to_date(const char *dirname)
 {
-	char path[PATH_MAX];
+	char path[PATH_MAX + 1];
 	DIR *d = opendir(dirname);
 	struct stat st;
 	size_t baselen;