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authorMaciej Wereski <m.wereski@partner.samsung.com>2015-09-08 15:36:30 +0200
committerMaciej Wereski <m.wereski@partner.samsung.com>2015-09-09 14:28:43 +0200
commita5bd3c32abb00ad945282568fd1a97c180b68047 (patch)
tree79bedcfbdc5643a4b0faa6d304b0dd416ec238d9 /src/libsystemd/sd-daemon/sd-daemon.c
parent542a69a284805aaf5b92b0e5da39339967d516e3 (diff)
sd_pid_notify_with_fds: fix computing msg_controllen
CMSG_SPACE(0) may return value other than 0. This caused sendmsg to fail with EINVAL, when have_pid or n_fds was 0.
Diffstat (limited to 'src/libsystemd/sd-daemon/sd-daemon.c')
-rw-r--r--src/libsystemd/sd-daemon/sd-daemon.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/libsystemd/sd-daemon/sd-daemon.c b/src/libsystemd/sd-daemon/sd-daemon.c
index d230a48daf..9ec73406c6 100644
--- a/src/libsystemd/sd-daemon/sd-daemon.c
+++ b/src/libsystemd/sd-daemon/sd-daemon.c
@@ -395,8 +395,9 @@ _public_ int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char
have_pid = pid != 0 && pid != getpid();
if (n_fds > 0 || have_pid) {
- msghdr.msg_controllen = CMSG_SPACE(sizeof(int) * n_fds) +
- CMSG_SPACE(sizeof(struct ucred) * 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);
cmsg = CMSG_FIRSTHDR(&msghdr);