This is a note to let you know that I've just added the patch titled

IPsec: do not ignore crypto err in ah4 input

to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: ipsec-do-not-ignore-crypto-err-in-ah4-input.patch and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Thu Nov 9 18:22:51 CET 2017

From: Gilad Ben-Yossef gilad@benyossef.com Date: Mon, 16 Jan 2017 13:17:55 +0200 Subject: IPsec: do not ignore crypto err in ah4 input

From: Gilad Ben-Yossef gilad@benyossef.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@benyossef.com Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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);

Patches currently in stable-queue which might be from gilad@benyossef.com are

queue-4.4/ipsec-do-not-ignore-crypto-err-in-ah4-input.patch