diff --git a/drivers/ipm/ipm_cavs_host.c b/drivers/ipm/ipm_cavs_host.c
index 7436770..028b9e9 100644
--- a/drivers/ipm/ipm_cavs_host.c
+++ b/drivers/ipm/ipm_cavs_host.c
@@ -56,7 +56,7 @@
 		return -EBUSY;
 	}
 
-	if (size > MAX_MSG) {
+	if ((size < 0) || (size > MAX_MSG)) {
 		return -EMSGSIZE;
 	}