[ 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.gupta@sophos.com Acked-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Sasha Levin sashal@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 173477211e40..76ad7e201626 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -151,6 +151,22 @@ 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;