From 1ebebe1d2f9cf8b2baa65b2c8651bf930464ad24 Mon Sep 17 00:00:00 2001
From: Jeffrey Altman <jaltman@secure-endpoints.com>
Date: Mon, 17 Jan 2022 21:36:49 -0500
Subject: [PATCH] lib/hcrypto: RSA_check_key if rsa->n is NULL cannot call
 RSA_size

Avoid a theoretical NULL pointer dereference.

Change-Id: Ia7b8671152b5444fd5cfdb3e37fd62e4db68c9c5
---
 lib/hcrypto/rsa.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/hcrypto/rsa.c b/lib/hcrypto/rsa.c
index 3638677c3..6172b2541 100644
--- a/lib/hcrypto/rsa.c
+++ b/lib/hcrypto/rsa.c
@@ -272,7 +272,10 @@ RSA_check_key(const RSA *key)
      * and then decrypt/verify.
      */
 
-    if ((rsa->d == NULL || rsa->n == NULL) &&
+    if (rsa->n == NULL)
+	return 0;
+
+    if (rsa->d == NULL &&
 	(rsa->p == NULL || rsa->q || rsa->dmp1 == NULL || rsa->dmq1 == NULL || rsa->iqmp == NULL))
 	return 0;