netdev - [PATCH 10/15] IPsec: do not ignore crypto err in ah6 input

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Message-ID: <1485937077-612-11-git-send-email-steffen.klassert@secunet.com>
Date:   Wed, 1 Feb 2017 09:17:52 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     David Miller <davem@...emloft.net>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        <netdev@...r.kernel.org>
Subject: [PATCH 10/15] IPsec: do not ignore crypto err in ah6 input

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

ah6 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>
---
 net/ipv6/ah6.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 189eb10..dda6035 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -474,6 +474,9 @@ static void ah6_input_done(struct crypto_async_request *base, int err)
 	int hdr_len = skb_network_header_len(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, hdr_len);
 	icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
-- 
1.9.1