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-rw-r--r--src/libsystemd-bus/bus-message.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/libsystemd-bus/bus-message.c b/src/libsystemd-bus/bus-message.c
index 0d565ddf9c..138d664f3c 100644
--- a/src/libsystemd-bus/bus-message.c
+++ b/src/libsystemd-bus/bus-message.c
@@ -4431,6 +4431,11 @@ int sd_bus_message_copy(sd_bus_message *m, sd_bus_message *source, int all) {
bool done_something = false;
int r;
+ assert_return(m, -EINVAL);
+ assert_return(source, -EINVAL);
+ assert_return(!m->sealed, -EPERM);
+ assert_return(source->sealed, -EPERM);
+
do {
const char *contents;
char type;