linux-kernel - [PATCH 3.16 13/47] xfrm: fix sa selector validation

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Message-ID: <lsq.1572026582.942700400@decadent.org.uk>
Date:   Fri, 25 Oct 2019 19:03:14 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Nicolas Dichtel" <nicolas.dichtel@...nd.com>,
        "Steffen Klassert" <steffen.klassert@...unet.com>,
        "Anirudh Gupta" <anirudh.gupta@...hos.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>
Subject: [PATCH 3.16 13/47] xfrm: fix sa selector validation

3.16.76-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Nicolas Dichtel <nicolas.dichtel@...nd.com>

commit b8d6d0079757cbd1b69724cfd1c08e2171c68cee upstream.

After commit b38ff4075a80, the following command does not work anymore:
$ ip xfrm state add src 10.125.0.2 dst 10.125.0.1 proto esp spi 34 reqid 1 \
  mode tunnel enc 'cbc(aes)' 0xb0abdba8b782ad9d364ec81e3a7d82a1 auth-trunc \
  'hmac(sha1)' 0xe26609ebd00acb6a4d51fca13e49ea78a72c73e6 96 flag align4

In fact, the selector is not mandatory, allow the user to provide an empty
selector.

Fixes: b38ff4075a80 ("xfrm: Fix xfrm sel prefix length validation")
CC: Anirudh Gupta <anirudh.gupta@...hos.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/xfrm/xfrm_user.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -165,6 +165,9 @@ static int verify_newsa_info(struct xfrm
 	}
 
 	switch (p->sel.family) {
+	case AF_UNSPEC:
+		break;
+
 	case AF_INET:
 		if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
 			goto out;