diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h
index 215f8f30ac5a5dcfa5126c8357da7cebf9639a1b..2a479785ebd419c30707547dcf4bf2dd5df2fdde 100644
--- a/security/selinux/ss/policydb.h
+++ b/security/selinux/ss/policydb.h
@@ -360,6 +360,8 @@ static inline int put_entry(const void *buf, size_t bytes, int num, struct polic
 {
 	size_t len = bytes * num;
 
+	if (len > fp->len)
+		return -EINVAL;
 	memcpy(fp->data, buf, len);
 	fp->data += len;
 	fp->len -= len;