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-rw-r--r--src/libsystemd/sd-daemon/sd-daemon.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/src/libsystemd/sd-daemon/sd-daemon.c b/src/libsystemd/sd-daemon/sd-daemon.c
index c9e2f2dba8..0842aba9cb 100644
--- a/src/libsystemd/sd-daemon/sd-daemon.c
+++ b/src/libsystemd/sd-daemon/sd-daemon.c
@@ -350,11 +350,7 @@ _public_ int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char
.msg_iovlen = 1,
.msg_name = &sockaddr,
};
- union {
- struct cmsghdr cmsghdr;
- uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
- CMSG_SPACE(sizeof(int) * n_fds)];
- } control;
+ struct cmsghdr *control;
_cleanup_close_ int fd = -1;
struct cmsghdr *cmsg = NULL;
const char *e;
@@ -398,8 +394,10 @@ _public_ int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char
if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
msghdr.msg_namelen = sizeof(struct sockaddr_un);
+ control = alloca(CMSG_SPACE(sizeof(struct ucred)) + CMSG_SPACE(sizeof(int) * n_fds));
+
if (n_fds > 0) {
- msghdr.msg_control = &control;
+ msghdr.msg_control = control;
msghdr.msg_controllen = CMSG_LEN(sizeof(int) * n_fds);
cmsg = CMSG_FIRSTHDR(&msghdr);
@@ -416,7 +414,7 @@ _public_ int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char
try_without_ucred = true;
controllen_without_ucred = msghdr.msg_controllen;
- msghdr.msg_control = &control;
+ msghdr.msg_control = control;
msghdr.msg_controllen += CMSG_LEN(sizeof(struct ucred));
if (cmsg)