diff --git a/spa/plugins/alsa/acp/alsa-mixer.c b/spa/plugins/alsa/acp/alsa-mixer.c
index c656e3357..e19700ecb 100644
--- a/spa/plugins/alsa/acp/alsa-mixer.c
+++ b/spa/plugins/alsa/acp/alsa-mixer.c
@@ -4742,6 +4742,10 @@ static int profile_verify(pa_alsa_profile *p) {
 	int count = 0;
 
 	f = open_memstream(&ptr, &size);
+	if (f == NULL) {
+            pa_log("failed to open memstream: %m");
+            return -1;
+	}
 
         if (p->output_mappings)
             PA_IDXSET_FOREACH(m, p->output_mappings, idx) {
@@ -4816,6 +4820,8 @@ void pa_alsa_decibel_fix_dump(pa_alsa_decibel_fix *db_fix) {
 	size_t size;
 
 	f = open_memstream(&ptr, &size);
+	if (f == NULL)
+		return;
 
         pa_assert(db_fix->min_step <= db_fix->max_step);
         nsteps = db_fix->max_step - db_fix->min_step + 1;
diff --git a/src/modules/module-protocol-pulse/extensions/ext-stream-restore.c b/src/modules/module-protocol-pulse/extensions/ext-stream-restore.c
index cb684cb3e..2524687f4 100644
--- a/src/modules/module-protocol-pulse/extensions/ext-stream-restore.c
+++ b/src/modules/module-protocol-pulse/extensions/ext-stream-restore.c
@@ -252,7 +252,9 @@ static int do_extension_stream_restore_write(struct client *client, uint32_t com
 		if (name == NULL || name[0] == '\0')
 			return -EPROTO;
 
-		f = open_memstream(&ptr, &size);
+		if ((f = open_memstream(&ptr, &size)) == NULL)
+			return -errno;
+
 		fprintf(f, "{");
 		fprintf(f, " \"mute\": %s", mute ? "true" : "false");
 		if (vol.channels > 0) {
diff --git a/src/modules/module-protocol-pulse/format.c b/src/modules/module-protocol-pulse/format.c
index f680e55d3..2e63ce73e 100644
--- a/src/modules/module-protocol-pulse/format.c
+++ b/src/modules/module-protocol-pulse/format.c
@@ -619,7 +619,9 @@ static int add_int(struct format_info *info, const char *k, struct spa_pod *para
 		size_t size;
 		FILE *f;
 
-		f = open_memstream(&ptr, &size);
+		if ((f = open_memstream(&ptr, &size)) == NULL)
+			return -errno;
+
 		fprintf(f, "[");
 		for (i = 1; i < n_values; i++)
 			fprintf(f, "%s %d", i == 1 ? "" : ",", values[i]);
diff --git a/src/modules/module-protocol-pulse/message-handler.c b/src/modules/module-protocol-pulse/message-handler.c
index c54bcecc1..8763ea74c 100644
--- a/src/modules/module-protocol-pulse/message-handler.c
+++ b/src/modules/module-protocol-pulse/message-handler.c
@@ -65,7 +65,7 @@ static int bluez_card_object_message_handler(struct pw_manager *m, struct pw_man
 
 		r = open_memstream(response, &size);
 		if (r == NULL)
-			return -ENOMEM;
+			return -errno;
 
 		fputc('[', r);
 		for (i = 0; i < n_codecs; ++i) {
@@ -100,7 +100,7 @@ static int core_object_message_handler(struct pw_manager *m, struct pw_manager_o
 
 		r = open_memstream(response, &size);
 		if (r == NULL)
-			return -ENOMEM;
+			return -errno;
 
 		fputc('[', r);
 		spa_list_for_each(o, &m->object_list, link) {
diff --git a/src/modules/module-protocol-pulse/modules/module-always-sink.c b/src/modules/module-protocol-pulse/modules/module-always-sink.c
index 20ac9b1d6..6250bd693 100644
--- a/src/modules/module-protocol-pulse/modules/module-always-sink.c
+++ b/src/modules/module-protocol-pulse/modules/module-always-sink.c
@@ -59,7 +59,9 @@ static int module_always_sink_load(struct client *client, struct module *module)
 	const char *str;
 	size_t size;
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	if ((str = pw_properties_get(module->props, "sink_name")) != NULL)
 		fprintf(f, " sink.name = \"%s\"", str);
diff --git a/src/modules/module-protocol-pulse/modules/module-echo-cancel.c b/src/modules/module-protocol-pulse/modules/module-echo-cancel.c
index 42628f119..132051d35 100644
--- a/src/modules/module-protocol-pulse/modules/module-echo-cancel.c
+++ b/src/modules/module-protocol-pulse/modules/module-echo-cancel.c
@@ -72,7 +72,9 @@ static int module_echo_cancel_load(struct client *client, struct module *module)
 	char *args;
 	size_t size;
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	/* Can't just serialise this dict because the "null" method gets
 	 * interpreted as a JSON null */
diff --git a/src/modules/module-protocol-pulse/modules/module-ladspa-sink.c b/src/modules/module-protocol-pulse/modules/module-ladspa-sink.c
index 9df350d12..d4b29fbb6 100644
--- a/src/modules/module-protocol-pulse/modules/module-ladspa-sink.c
+++ b/src/modules/module-protocol-pulse/modules/module-ladspa-sink.c
@@ -78,7 +78,9 @@ static int module_ladspa_sink_load(struct client *client, struct module *module)
 	pw_properties_setf(data->capture_props, "pulse.module.id", "%u", module->index);
 	pw_properties_setf(data->playback_props, "pulse.module.id", "%u", module->index);
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &module->props->dict, 0);
 	fprintf(f, " filter.graph = {");
diff --git a/src/modules/module-protocol-pulse/modules/module-ladspa-source.c b/src/modules/module-protocol-pulse/modules/module-ladspa-source.c
index 1ac2d5f90..a30791521 100644
--- a/src/modules/module-protocol-pulse/modules/module-ladspa-source.c
+++ b/src/modules/module-protocol-pulse/modules/module-ladspa-source.c
@@ -78,7 +78,9 @@ static int module_ladspa_source_load(struct client *client, struct module *modul
 	pw_properties_setf(data->capture_props, "pulse.module.id", "%u", module->index);
 	pw_properties_setf(data->playback_props, "pulse.module.id", "%u", module->index);
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &module->props->dict, 0);
 	fprintf(f, " filter.graph = {");
diff --git a/src/modules/module-protocol-pulse/modules/module-loopback.c b/src/modules/module-protocol-pulse/modules/module-loopback.c
index bceef11d2..2f012bc8e 100644
--- a/src/modules/module-protocol-pulse/modules/module-loopback.c
+++ b/src/modules/module-protocol-pulse/modules/module-loopback.c
@@ -75,7 +75,9 @@ static int module_loopback_load(struct client *client, struct module *module)
 	pw_properties_setf(data->capture_props, "pulse.module.id", "%u", module->index);
 	pw_properties_setf(data->playback_props, "pulse.module.id", "%u", module->index);
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	if (data->info.channels != 0) {
 		fprintf(f, " audio.channels = %u", data->info.channels);
diff --git a/src/modules/module-protocol-pulse/modules/module-remap-sink.c b/src/modules/module-protocol-pulse/modules/module-remap-sink.c
index 880571a20..0a1d668d8 100644
--- a/src/modules/module-protocol-pulse/modules/module-remap-sink.c
+++ b/src/modules/module-protocol-pulse/modules/module-remap-sink.c
@@ -72,7 +72,9 @@ static int module_remap_sink_load(struct client *client, struct module *module)
 	pw_properties_setf(data->capture_props, "pulse.module.id", "%u", module->index);
 	pw_properties_setf(data->playback_props, "pulse.module.id", "%u", module->index);
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &module->props->dict, 0);
 	fprintf(f, " capture.props = {");
diff --git a/src/modules/module-protocol-pulse/modules/module-remap-source.c b/src/modules/module-protocol-pulse/modules/module-remap-source.c
index aee0173d1..984444df1 100644
--- a/src/modules/module-protocol-pulse/modules/module-remap-source.c
+++ b/src/modules/module-protocol-pulse/modules/module-remap-source.c
@@ -72,7 +72,9 @@ static int module_remap_source_load(struct client *client, struct module *module
 	pw_properties_setf(data->capture_props, "pulse.module.id", "%u", module->index);
 	pw_properties_setf(data->playback_props, "pulse.module.id", "%u", module->index);
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &module->props->dict, 0);
 	fprintf(f, " capture.props = { ");
diff --git a/src/modules/module-protocol-pulse/modules/module-roc-sink.c b/src/modules/module-protocol-pulse/modules/module-roc-sink.c
index ac1477513..cb4c2bfb5 100644
--- a/src/modules/module-protocol-pulse/modules/module-roc-sink.c
+++ b/src/modules/module-protocol-pulse/modules/module-roc-sink.c
@@ -73,7 +73,9 @@ static int module_roc_sink_load(struct client *client, struct module *module)
 	pw_properties_setf(data->sink_props, "pulse.module.id",
 			"%u", module->index);
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &data->roc_props->dict, 0);
 	fprintf(f, " } sink.props = {");
diff --git a/src/modules/module-protocol-pulse/modules/module-roc-source.c b/src/modules/module-protocol-pulse/modules/module-roc-source.c
index 25cda043d..7ab083eaa 100644
--- a/src/modules/module-protocol-pulse/modules/module-roc-source.c
+++ b/src/modules/module-protocol-pulse/modules/module-roc-source.c
@@ -73,7 +73,9 @@ static int module_roc_source_load(struct client *client, struct module *module)
 	pw_properties_setf(data->source_props, "pulse.module.id",
 			"%u", module->index);
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &data->roc_props->dict, 0);
 	fprintf(f, " } source.props = {");
diff --git a/src/modules/module-protocol-pulse/modules/module-simple-protocol-tcp.c b/src/modules/module-protocol-pulse/modules/module-simple-protocol-tcp.c
index 78a79579f..76025a73e 100644
--- a/src/modules/module-protocol-pulse/modules/module-simple-protocol-tcp.c
+++ b/src/modules/module-protocol-pulse/modules/module-simple-protocol-tcp.c
@@ -68,7 +68,9 @@ static int module_simple_protocol_tcp_load(struct client *client, struct module
 	uint32_t i;
 	FILE *f;
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	if (data->info.rate != 0)
 		fprintf(f, " \"audio.rate\": %u,", data->info.rate);
diff --git a/src/modules/module-protocol-pulse/modules/module-tunnel-sink.c b/src/modules/module-protocol-pulse/modules/module-tunnel-sink.c
index 29eead8ec..82786e2b2 100644
--- a/src/modules/module-protocol-pulse/modules/module-tunnel-sink.c
+++ b/src/modules/module-protocol-pulse/modules/module-tunnel-sink.c
@@ -76,7 +76,9 @@ static int module_tunnel_sink_load(struct client *client, struct module *module)
 	pw_properties_setf(data->stream_props, "pulse.module.id",
 			"%u", module->index);
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &module->props->dict, 0);
 	fprintf(f, " pulse.server.address = \"%s\" ", server);
diff --git a/src/modules/module-protocol-pulse/modules/module-tunnel-source.c b/src/modules/module-protocol-pulse/modules/module-tunnel-source.c
index 25e384055..987a300d2 100644
--- a/src/modules/module-protocol-pulse/modules/module-tunnel-source.c
+++ b/src/modules/module-protocol-pulse/modules/module-tunnel-source.c
@@ -76,7 +76,9 @@ static int module_tunnel_source_load(struct client *client, struct module *modul
 
 	server = pw_properties_get(module->props, "server");
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &module->props->dict, 0);
 	fprintf(f, " pulse.server.address = \"%s\" ", server);
diff --git a/src/modules/module-protocol-pulse/modules/module-x11-bell.c b/src/modules/module-protocol-pulse/modules/module-x11-bell.c
index 51fa61213..a71f9e36f 100644
--- a/src/modules/module-protocol-pulse/modules/module-x11-bell.c
+++ b/src/modules/module-protocol-pulse/modules/module-x11-bell.c
@@ -59,7 +59,9 @@ static int module_x11_bell_load(struct client *client, struct module *module)
 	const char *str;
 	size_t size;
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL)
+		return -errno;
+
 	fprintf(f, "{");
 	if ((str = pw_properties_get(module->props, "sink")) != NULL)
 		fprintf(f, " sink.name = \"%s\"", str);
diff --git a/src/modules/module-raop-discover.c b/src/modules/module-raop-discover.c
index 514a7fb21..4c519d191 100644
--- a/src/modules/module-raop-discover.c
+++ b/src/modules/module-raop-discover.c
@@ -321,7 +321,11 @@ static void resolver_cb(AvahiServiceResolver *r, AvahiIfIndex interface, AvahiPr
 	}
 
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL) {
+		pw_log_error("Can't open memstream: %m");
+		goto done;
+	}
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &props->dict, 0);
 	fprintf(f, " stream.props = {");
diff --git a/src/modules/module-raop/rtsp-client.c b/src/modules/module-raop/rtsp-client.c
index 9bb888773..c241bf40d 100644
--- a/src/modules/module-raop/rtsp-client.c
+++ b/src/modules/module-raop/rtsp-client.c
@@ -478,7 +478,8 @@ int pw_rtsp_client_send(struct pw_rtsp_client *client,
 	struct message *msg;
 	int cseq;
 
-	f = open_memstream((char**)&msg, &len);
+	if ((f = open_memstream((char**)&msg, &len)) == NULL)
+		return -errno;
 
 	fseek(f, sizeof(*msg), SEEK_SET);
 
diff --git a/src/modules/module-zeroconf-discover.c b/src/modules/module-zeroconf-discover.c
index 0ba531fd4..786a0132b 100644
--- a/src/modules/module-zeroconf-discover.c
+++ b/src/modules/module-zeroconf-discover.c
@@ -329,7 +329,11 @@ static void resolver_cb(AvahiServiceResolver *r, AvahiIfIndex interface, AvahiPr
 				_("%s on %s"), desc, fqdn);
 	}
 
-	f = open_memstream(&args, &size);
+	if ((f = open_memstream(&args, &size)) == NULL) {
+		pw_log_error("Can't open memstream: %m");
+		goto done;
+	}
+
 	fprintf(f, "{");
 	pw_properties_serialize_dict(f, &props->dict, 0);
 	fprintf(f, " stream.props = {");
diff --git a/src/tools/pw-loopback.c b/src/tools/pw-loopback.c
index ebae79cd5..00fafd093 100644
--- a/src/tools/pw-loopback.c
+++ b/src/tools/pw-loopback.c
@@ -202,7 +202,11 @@ int main(int argc, char *argv[])
 	}
 
 
-        f = open_memstream(&args, &size);
+        if ((f = open_memstream(&args, &size)) == NULL) {
+		fprintf(stderr, "can't open memstream: %m\n");
+		goto exit;
+	}
+
 	fprintf(f, "{");
 
 	if (opt_remote != NULL)