diff --git a/backend/drm/util.c b/backend/drm/util.c
index 25256343..37d99aa8 100644
--- a/backend/drm/util.c
+++ b/backend/drm/util.c
@@ -223,7 +223,7 @@ static bool match_obj_(struct match_state *st, size_t skips, size_t score, size_
 		if (score > st->score || (score == st->score && replaced < st->replaced)) {
 			st->score = score;
 			st->replaced = replaced;
-			memcpy(st->best, st->res, sizeof st->best[0] * st->num_res);
+			memcpy(st->best, st->res, sizeof(st->best[0]) * st->num_res);
 
 			if (st->score == st->num_objs && st->replaced == 0) {
 				st->exit_early = true;
diff --git a/examples/screenshot.c b/examples/screenshot.c
index 932f5e37..77652805 100644
--- a/examples/screenshot.c
+++ b/examples/screenshot.c
@@ -95,7 +95,7 @@ static void handle_global(void *data, struct wl_registry *registry,
 	static struct screenshooter_output *output;
 
 	if (strcmp(interface, "wl_output") == 0) {
-		output = calloc(1, sizeof *output);
+		output = calloc(1, sizeof(*output));
 		output->output = wl_registry_bind(registry, name, &wl_output_interface,
 			1);
 		wl_list_insert(&output_list, &output->link);
diff --git a/types/wlr_data_device.c b/types/wlr_data_device.c
index af81d861..a9f54a0b 100644
--- a/types/wlr_data_device.c
+++ b/types/wlr_data_device.c
@@ -901,12 +901,15 @@ static void data_source_offer(struct wl_client *client,
 		wl_resource_get_user_data(resource);
 	char **p;
 
-	p = wl_array_add(&source->mime_types, sizeof *p);
+	p = wl_array_add(&source->mime_types, sizeof(*p));
 
 	if (p) {
 		*p = strdup(mime_type);
 	}
 	if (!p || !*p){
+		if (p) {
+			source->mime_types.size -= sizeof(*p);
+		}
 		wl_resource_post_no_memory(resource);
 	}
 }
diff --git a/types/wlr_primary_selection.c b/types/wlr_primary_selection.c
index 8163d2e5..1228e94e 100644
--- a/types/wlr_primary_selection.c
+++ b/types/wlr_primary_selection.c
@@ -127,6 +127,9 @@ static void source_handle_offer(struct wl_client *client,
 		*p = strdup(mime_type);
 	}
 	if (p == NULL || *p == NULL) {
+		if (p) {
+			source->mime_types.size -= sizeof(*p);
+		}
 		wl_resource_post_no_memory(resource);
 	}
 }
diff --git a/types/wlr_seat.c b/types/wlr_seat.c
index 156ac142..2a79f784 100644
--- a/types/wlr_seat.c
+++ b/types/wlr_seat.c
@@ -876,6 +876,11 @@ void wlr_seat_keyboard_enter(struct wlr_seat *seat,
 		wl_array_init(&keys);
 		for (size_t i = 0; i < keyboard->num_keycodes; ++i) {
 			uint32_t *p = wl_array_add(&keys, sizeof(uint32_t));
+			if (!p) {
+				wlr_log(L_ERROR, "Cannot allocate memory, skipping keycode: %d\n",
+					keyboard->keycodes[i]);
+				continue;
+			}
 			*p = keyboard->keycodes[i];
 		}
 		uint32_t serial = wl_display_next_serial(seat->display);
diff --git a/types/wlr_xdg_shell_v6.c b/types/wlr_xdg_shell_v6.c
index ead5a73e..1c46197e 100644
--- a/types/wlr_xdg_shell_v6.c
+++ b/types/wlr_xdg_shell_v6.c
@@ -922,18 +922,34 @@ static void wlr_xdg_toplevel_v6_send_configure(
 	wl_array_init(&states);
 	if (surface->toplevel_state->pending.maximized) {
 		s = wl_array_add(&states, sizeof(uint32_t));
+		if (!s) {
+			wlr_log(L_ERROR, "Could not allocate state for maximized xdg_toplevel");
+			goto error_out;
+		}
 		*s = ZXDG_TOPLEVEL_V6_STATE_MAXIMIZED;
 	}
 	if (surface->toplevel_state->pending.fullscreen) {
 		s = wl_array_add(&states, sizeof(uint32_t));
+		if (!s) {
+			wlr_log(L_ERROR, "Could not allocate state for fullscreen xdg_toplevel");
+			goto error_out;
+		}
 		*s = ZXDG_TOPLEVEL_V6_STATE_FULLSCREEN;
 	}
 	if (surface->toplevel_state->pending.resizing) {
 		s = wl_array_add(&states, sizeof(uint32_t));
+		if (!s) {
+			wlr_log(L_ERROR, "Could not allocate state for resizing xdg_toplevel");
+			goto error_out;
+		}
 		*s = ZXDG_TOPLEVEL_V6_STATE_RESIZING;
 	}
 	if (surface->toplevel_state->pending.activated) {
 		s = wl_array_add(&states, sizeof(uint32_t));
+		if (!s) {
+			wlr_log(L_ERROR, "Could not allocate state for activated xdg_toplevel");
+			goto error_out;
+		}
 		*s = ZXDG_TOPLEVEL_V6_STATE_ACTIVATED;
 	}
 
@@ -949,6 +965,11 @@ static void wlr_xdg_toplevel_v6_send_configure(
 		height, &states);
 
 	wl_array_release(&states);
+	return;
+
+error_out:
+	wl_array_release(&states);
+	wl_resource_post_no_memory(surface->toplevel_state->resource);
 }
 
 static void wlr_xdg_surface_send_configure(void *user_data) {
diff --git a/xwayland/selection.c b/xwayland/selection.c
index 0d7f1588..00e45182 100644
--- a/xwayland/selection.c
+++ b/xwayland/selection.c
@@ -55,6 +55,10 @@ static int xwm_read_data_source(int fd, uint32_t mask, void *data) {
 	int current = selection->source_data.size;
 	if (selection->source_data.size < incr_chunk_size) {
 		p = wl_array_add(&selection->source_data, incr_chunk_size);
+		if (!p){
+			wlr_log(L_ERROR, "Could not allocate selection source_data");
+			goto error_out;
+		}
 	} else {
 		p = (char *) selection->source_data.data + selection->source_data.size;
 	}
@@ -64,11 +68,7 @@ static int xwm_read_data_source(int fd, uint32_t mask, void *data) {
 	int len = read(fd, p, available);
 	if (len == -1) {
 		wlr_log(L_ERROR, "read error from data source: %m");
-		xwm_selection_send_notify(selection, XCB_ATOM_NONE);
-		wl_event_source_remove(selection->property_source);
-		selection->property_source = NULL;
-		close(fd);
-		wl_array_release(&selection->source_data);
+		goto error_out;
 	}
 
 	wlr_log(L_DEBUG, "read %d (available %d, mask 0x%x) bytes: \"%.*s\"",
@@ -140,6 +140,14 @@ static int xwm_read_data_source(int fd, uint32_t mask, void *data) {
 	}
 
 	return 1;
+
+error_out:
+	xwm_selection_send_notify(selection, XCB_ATOM_NONE);
+	wl_event_source_remove(selection->property_source);
+	selection->property_source = NULL;
+	close(fd);
+	wl_array_release(&selection->source_data);
+	return 0;
 }
 
 static void xwm_selection_source_send(struct wlr_xwm_selection *selection,