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From 5a282fc000a52fe98a31ac69832678b1d1d5778d Mon Sep 17 00:00:00 2001
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From: Maciej Wereski <m.wereski@partner.samsung.com>
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Date: Tue, 8 Sep 2015 15:36:30 +0200
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Subject: [PATCH] sd_pid_notify_with_fds: fix computing msg_controllen
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CMSG_SPACE(0) may return value other than 0. This caused sendmsg to fail
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with EINVAL, when have_pid or n_fds was 0.
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Cherry-picked from: a5bd3c32abb00ad945282568fd1a97c180b68047
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Resolves: #1381743
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---
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src/libsystemd/sd-daemon/sd-daemon.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/src/libsystemd/sd-daemon/sd-daemon.c b/src/libsystemd/sd-daemon/sd-daemon.c
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index 1474321c95..2c4dd9d225 100644
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--- a/src/libsystemd/sd-daemon/sd-daemon.c
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+++ b/src/libsystemd/sd-daemon/sd-daemon.c
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@@ -397,8 +397,9 @@ _public_ int sd_pid_notify_with_fds(pid_t pid, int unset_environment, const char
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have_pid = pid != 0 && pid != getpid();
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if (n_fds > 0 || have_pid) {
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- msghdr.msg_controllen = CMSG_SPACE(sizeof(int) * n_fds) +
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- CMSG_SPACE(sizeof(struct ucred) * have_pid);
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+ /* CMSG_SPACE(0) may return value different then zero, which results in miscalculated controllen. */
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+ msghdr.msg_controllen = (n_fds ? CMSG_SPACE(sizeof(int) * n_fds) : 0) +
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+ CMSG_SPACE(sizeof(struct ucred)) * have_pid;
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msghdr.msg_control = alloca(msghdr.msg_controllen);
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cmsg = CMSG_FIRSTHDR(&msghdr);
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