sd-bus: fix handling of double parameters in sd_bus_message_append()

We really need to use va_arg() with the right type here as uint64_t and
double might have the same size, but are passed differently as
arguments.

2 files changed, 22 insertions, 2 deletions

diff --git a/src/libsystemd/sd-bus/bus-message.c b/src/libsystemd/sd-bus/bus-message.c
index 23076d25dd..9ae65bebc8 100644
--- a/src/libsystemd/sd-bus/bus-message.c
+++ b/src/libsystemd/sd-bus/bus-message.c
@@ -2350,8 +2350,7 @@ int bus_message_append_ap(
                 }
 
                 case SD_BUS_TYPE_INT64:
-                case SD_BUS_TYPE_UINT64:
-                case SD_BUS_TYPE_DOUBLE: {
+                case SD_BUS_TYPE_UINT64: {
                         uint64_t x;
 
                         x = va_arg(ap, uint64_t);
@@ -2359,6 +2358,14 @@ int bus_message_append_ap(
                         break;
                 }
 
+                case SD_BUS_TYPE_DOUBLE: {
+                        double x;
+
+                        x = va_arg(ap, double);
+                        r = sd_bus_message_append_basic(m, *t, &x);
+                        break;
+                }
+
                 case SD_BUS_TYPE_STRING:
                 case SD_BUS_TYPE_OBJECT_PATH:
                 case SD_BUS_TYPE_SIGNATURE: {
diff --git a/src/libsystemd/sd-bus/test-bus-marshal.c b/src/libsystemd/sd-bus/test-bus-marshal.c
index 8cefc7a154..d95a03c221 100644
--- a/src/libsystemd/sd-bus/test-bus-marshal.c
+++ b/src/libsystemd/sd-bus/test-bus-marshal.c
@@ -22,6 +22,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <byteswap.h>
+#include <math.h>
 
 #ifdef HAVE_GLIB
 #include <gio/gio.h>
@@ -94,6 +95,8 @@ int main(int argc, char *argv[]) {
         _cleanup_fclose_ FILE *ms = NULL;
         size_t first_size = 0, second_size = 0, third_size = 0;
         _cleanup_bus_unref_ sd_bus *bus = NULL;
+        double dbl;
+        uint64_t u64;
 
         r = sd_bus_default_system(&bus);
         if (r < 0)
@@ -145,6 +148,9 @@ int main(int argc, char *argv[]) {
         r = sd_bus_message_append_array(m, 'u', NULL, 0);
         assert_se(r >= 0);
 
+        r = sd_bus_message_append(m, "a(stdo)", 1, "foo", 815ULL, 47.0, "/");
+        assert_se(r >= 0);
+
         r = bus_message_seal(m, 4711, 0);
         assert_se(r >= 0);
 
@@ -268,6 +274,13 @@ int main(int argc, char *argv[]) {
         assert_se(r > 0);
         assert_se(sz == 0);
 
+        r = sd_bus_message_read(m, "a(stdo)", 1, &x, &u64, &dbl, &y);
+        assert_se(r > 0);
+        assert_se(streq(x, "foo"));
+        assert_se(u64 == 815ULL);
+        assert_se(fabs(dbl - 47.0) < 0.1);
+        assert_se(streq(y, "/"));
+
         r = sd_bus_message_peek_type(m, NULL, NULL);
         assert_se(r == 0);