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Date:   Wed, 25 Oct 2017 01:56:17 +0000
From:   "Levin, Alexander (Sasha Levin)" <>
To:     "" <>,
        "" <>
Cc:     Gilad Ben-Yossef <>,
        Steffen Klassert <>,
        "Levin, Alexander (Sasha Levin)" <>
Subject: [PATCH AUTOSEL for 4.4 20/25] IPsec: do not ignore crypto err in ah4

From: Gilad Ben-Yossef <>

[ 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 <>
Signed-off-by: Steffen Klassert <>
Signed-off-by: Sasha Levin <>
 net/ipv4/ah4.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index f2a71025a770..22377c8ff14b 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -270,6 +270,9 @@ static void ah_input_done(struct crypto_async_request *base, int err)
 	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);

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