diff --git a/firmware/asm/lcd-as-memframe.c b/firmware/asm/lcd-as-memframe.c
index e952f4f7f05..7e352aea051 100644
--- a/firmware/asm/lcd-as-memframe.c
+++ b/firmware/asm/lcd-as-memframe.c
@@ -3,8 +3,10 @@
 #include "lcd.h"
 void lcd_copy_buffer_rect(fb_data *dst, fb_data *src, int width, int height)
 {
+    if (width <= 0 || width > LCD_WIDTH || height <= 0)
+        return;
     do {
-        memcpy(dst, src, width * sizeof(fb_data));
+        memcpy(dst, src, (size_t)width * sizeof(fb_data));
         src += LCD_WIDTH;
         dst += LCD_WIDTH;
     } while (--height);