sd-daemon: wipe out memory before using CMSG_NXTHDR()

[elogind.git] / src / libelogind / sd-daemon / sd-daemon.c

diff --git a/src/libelogind/sd-daemon/sd-daemon.c b/src/libelogind/sd-daemon/sd-daemon.c
index c6224f8c7031eb12c6982c12f25fc8feb8f4103e..e10444f498eae0efa71bb8a37e9642b704cc0b64 100644 (file)
--- a/src/libelogind/sd-daemon/sd-daemon.c
+++ b/src/libelogind/sd-daemon/sd-daemon.c
@@ -456,9 +456,11 @@ _public_ int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char
 
         if (n_fds > 0 || have_pid) {
                 /* CMSG_SPACE(0) may return value different then zero, which results in miscalculated controllen. */
-                msghdr.msg_controllen = (n_fds ? CMSG_SPACE(sizeof(int) * n_fds) : 0) +
-                                        CMSG_SPACE(sizeof(struct ucred)) * have_pid;
-                msghdr.msg_control = alloca(msghdr.msg_controllen);
+                msghdr.msg_controllen =
+                        (n_fds > 0 ? CMSG_SPACE(sizeof(int) * n_fds) : 0) +
+                        (have_pid ? CMSG_SPACE(sizeof(struct ucred)) : 0);
+
+                msghdr.msg_control = alloca0(msghdr.msg_controllen);
 
                 cmsg = CMSG_FIRSTHDR(&msghdr);
                 if (n_fds > 0) {
@@ -513,9 +515,12 @@ finish:
         return r;
 }
 
+/// UNNEEDED by elogind
+#if 0
 _public_ int sd_pid_notify(pid_t pid, int unset_environment, const char *state) {
         return sd_pid_notify_with_fds(pid, unset_environment, state, NULL, 0);
 }
+#endif // 0
 
 _public_ int sd_notify(int unset_environment, const char *state) {
         return sd_pid_notify_with_fds(0, unset_environment, state, NULL, 0);