[PATCH AUTOSEL 4.14 020/105] xfrm: Fix xfrm sel prefix length validation

[Sasha Levin]

From: Anirudh Gupta <anirudhr...@gmail.com>

[ Upstream commit b38ff4075a80b4da5cb2202d7965332ca0efb213 ]

Family of src/dst can be different from family of selector src/dst.
Use xfrm selector family to validate address prefix length,
while verifying new sa from userspace.

Validated patch with this command:
ip xfrm state add src 1.1.6.1 dst 1.1.6.2 proto esp spi 4260196 \
reqid 20004 mode tunnel aead "rfc4106(gcm(aes))" \
0x1111016400000000000000000000000044440001 128 \
sel src 1011:1:4::2/128 sel dst 1021:1:4::2/128 dev Port5

Fixes: 07bf7908950a ("xfrm: Validate address prefix lengths in the xfrm 
selector.")
Signed-off-by: Anirudh Gupta <anirudh.gu...@sophos.com>
Acked-by: Herbert Xu <herb...@gondor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 net/xfrm/xfrm_user.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 919b8406028c..b25b68ae7c74 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -150,6 +150,22 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
 
        err = -EINVAL;
        switch (p->family) {
+       case AF_INET:
+               break;
+
+       case AF_INET6:
+#if IS_ENABLED(CONFIG_IPV6)
+               break;
+#else
+               err = -EAFNOSUPPORT;
+               goto out;
+#endif
+
+       default:
+               goto out;
+       }
+
+       switch (p->sel.family) {
        case AF_INET:
                if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
                        goto out;
-- 
2.20.1