diff --git a/rust/kernel/dma.rs b/rust/kernel/dma.rs
index e275f2562a5b..e8f2bb3631d6 100644
--- a/rust/kernel/dma.rs
+++ b/rust/kernel/dma.rs
@@ -967,7 +967,11 @@ fn write_to_slice(
             return Ok(0);
         };
 
-        let count = self.size().saturating_sub(offset_val).min(writer.len());
+        if offset_val >= self.size() {
+            return Ok(0);
+        }
+
+        let count = (self.size() - offset_val).min(writer.len());
 
         writer.write_dma(self, offset_val, count)?;