From 291bb0b01cae22c3c14882fd5a0ad557c92d9298 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Mon, 9 Nov 2020 14:33:16 +0900
Subject: [PATCH] sd-bus: fix possible division by 0

Fixes #17541.
---
 src/libsystemd/sd-bus/bus-message.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libsystemd/sd-bus/bus-message.c b/src/libsystemd/sd-bus/bus-message.c
index f966dda229..b8cd5e6417 100644
--- a/src/libsystemd/sd-bus/bus-message.c
+++ b/src/libsystemd/sd-bus/bus-message.c
@@ -3189,6 +3189,8 @@ static int container_next_item(sd_bus_message *m, struct bus_container *c, size_
                 int sz;
 
                 sz = bus_gvariant_get_size(c->signature);
+                if (sz == 0)
+                        return -EBADMSG;
                 if (sz < 0) {
                         int alignment;