linux-kernel - [PATCH 4.4 20/56] IPsec: do not ignore crypto err in ah4 input

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Message-Id: <20171113125600.166818338@linuxfoundation.org>
Date:   Mon, 13 Nov 2017 13:55:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gilad Ben-Yossef <gilad@...yossef.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 20/56] IPsec: do not ignore crypto err in ah4 input

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gilad Ben-Yossef <gilad@...yossef.com>


[ Upstream commit ebd89a2d0675f1325c2be5b7576fd8cb7e8defd0 ]

ah4 input processing uses the asynchronous hash crypto API which
supplies an error code as part of the operation completion but
the error code was being ignored.

Treat a crypto API error indication as a verification failure.

While a crypto API reported error would almost certainly result
in a memcpy of the digest failing anyway and thus the security
risk seems minor, performing a memory compare on what might be
uninitialized memory is wrong.

Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/ah4.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -270,6 +270,9 @@ static void ah_input_done(struct crypto_
 	int ihl = ip_hdrlen(skb);
 	int ah_hlen = (ah->hdrlen + 2) << 2;
 
+	if (err)
+		goto out;
+
 	work_iph = AH_SKB_CB(skb)->tmp;
 	auth_data = ah_tmp_auth(work_iph, ihl);
 	icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);