From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Sesterhenn , David Howells Subject: [PATCH 4.4 24/27] pkcs7: Prevent NULL pointer dereference, since sinfo is not always set. Date: Tue, 24 Oct 2017 14:58:09 +0200 Message-Id: <20171024125712.052994580@linuxfoundation.org> In-Reply-To: <20171024125711.074929246@linuxfoundation.org> References: <20171024125711.074929246@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Sesterhenn commit 68a1fdbbf8bd3378325e45c19e167a165f9ffc3a upstream. The ASN.1 parser does not necessarily set the sinfo field, this patch prevents a NULL pointer dereference on broken input. Fixes: 99db44350672 ("PKCS#7: Appropriately restrict authenticated attributes and content type") Signed-off-by: Eric Sesterhenn Signed-off-by: David Howells Signed-off-by: Greg Kroah-Hartman --- crypto/asymmetric_keys/pkcs7_parser.c | 3 +++ 1 file changed, 3 insertions(+) --- a/crypto/asymmetric_keys/pkcs7_parser.c +++ b/crypto/asymmetric_keys/pkcs7_parser.c @@ -90,6 +90,9 @@ static int pkcs7_check_authattrs(struct bool want; sinfo = msg->signed_infos; + if (!sinfo) + goto inconsistent; + if (sinfo->authattrs) { want = true; msg->have_authattrs = true;