From: Eric Biggers Subject: [PATCH] pkcs7: fix check for self-signed certificate Date: Sun, 26 Nov 2017 23:19:42 -0800 Message-ID: <20171127071942.26214-1-ebiggers3@gmail.com> Cc: linux-crypto@vger.kernel.org, Eric Biggers To: keyrings@vger.kernel.org, David Howells Return-path: Received: from mail-pg0-f67.google.com ([74.125.83.67]:44331 "EHLO mail-pg0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750838AbdK0HTr (ORCPT ); Mon, 27 Nov 2017 02:19:47 -0500 Sender: linux-crypto-owner@vger.kernel.org List-ID: From: Eric Biggers pkcs7_validate_trust_one() used 'x509->next == x509' to identify a self-signed certificate. That's wrong; ->next is simply the link in the linked list of certificates in the PKCS#7 message. It should be checking ->signer instead. Fix it. Fortunately this didn't actually matter because when we re-visited 'x509' on the next iteration via 'x509->signer', it was already seen and not verified, so we returned -ENOKEY anyway. Signed-off-by: Eric Biggers --- crypto/asymmetric_keys/pkcs7_trust.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/crypto/asymmetric_keys/pkcs7_trust.c b/crypto/asymmetric_keys/pkcs7_trust.c index f6a009d88a33..1f4e25f10049 100644 --- a/crypto/asymmetric_keys/pkcs7_trust.c +++ b/crypto/asymmetric_keys/pkcs7_trust.c @@ -69,7 +69,7 @@ static int pkcs7_validate_trust_one(struct pkcs7_message *pkcs7, /* Self-signed certificates form roots of their own, and if we * don't know them, then we can't accept them. */ - if (x509->next == x509) { + if (x509->signer == x509) { kleave(" = -ENOKEY [unknown self-signed]"); return -ENOKEY; } -- 2.15.0