config.c: Fix strncpy() truncation warning

Fix the following strncpy() string truncation warning:

In function ‘strncpy’,
    inlined from ‘cgroup_config_create_template_group’ at config.c:1841:5:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:106:10: warning: ‘__builtin_strncpy’ output may be truncated copying 4095 bytes from a string of length 4095 [-Wstringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

diff --git a/src/config.c b/src/config.c
index 11d1da4897d0957664d80d2463db17ec7cd7d3d0..ae4f88c80a94812bb6f564d169205a51fd97c26d 100644 (file)
--- a/src/config.c
+++ b/src/config.c
@@ -1840,6 +1840,7 @@ int cgroup_config_create_template_group(struct cgroup *cgroup,
                                /* variables substituted in template */
                                strncpy(buffer, t_cgroup->name,
                                        FILENAME_MAX-1);
+                               buffer[sizeof(buffer) - 1] = '\0';
                                strncpy(t_cgroup->name, cgroup->name,
                                        FILENAME_MAX-1);