cgroups: fix buffer out-of-bounds access in enable_controllers_delegation

Reported-by: coverity (CID #1517317)
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>

diff --git a/src/lxc/cgroups/cgfsng.c b/src/lxc/cgroups/cgfsng.c
index dc4caa2b4d407bf2881fa53ed10daf96a2741743..8a3693d29ed69488f065b5ec1f75dfee0721b516 100644 (file)
--- a/src/lxc/cgroups/cgfsng.c
+++ b/src/lxc/cgroups/cgfsng.c
@@ -1162,7 +1162,7 @@ static bool enable_controllers_delegation(int fd_dir, char *cg)
 
        lxc_iterate_parts(controller, rbuf, " ") {
                full_len += strlen(controller) + 2;
-               wbuf = must_realloc(wbuf, full_len);
+               wbuf = must_realloc(wbuf, full_len + 1);
                if (first) {
                        wbuf[0] = '\0';
                        first = false;