[PATCH 3.16 06/47] xfrm: Fix xfrm sel prefix length validation

From: Ben Hutchings
Date: Fri Oct 25 2019 - 14:07:13 EST


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

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

From: Anirudh Gupta <anirudhrudr@xxxxxxxxx>

commit b38ff4075a80b4da5cb2202d7965332ca0efb213 upstream.

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.gupta@xxxxxxxxxx>
Acked-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
net/xfrm/xfrm_user.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -150,6 +150,22 @@ static int verify_newsa_info(struct xfrm
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;