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