netdev - [PATCH ipsec] xfrm: Pass template address family to xfrm_state_look

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Date:   Mon,  2 Nov 2020 18:32:19 -0800
From:   Anthony DeRossi <ajderossi@...il.com>
To:     netdev@...r.kernel.org
Cc:     steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, kuba@...nel.org
Subject: [PATCH ipsec] xfrm: Pass template address family to xfrm_state_look_at

This fixes a regression where valid selectors are incorrectly skipped
when xfrm_state_find is called with a non-matching address family (e.g.
when using IPv6-in-IPv4 ESP in transport mode).

The state's address family is matched against the template's family
(encap_family) in xfrm_state_find before checking the selector in
xfrm_state_look_at.  The template's family should also be used for
selector matching, otherwise valid selectors may be skipped.

Fixes: e94ee171349d ("xfrm: Use correct address family in xfrm_state_find")
Signed-off-by: Anthony DeRossi <ajderossi@...il.com>
---
 net/xfrm/xfrm_state.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index ee6ac32bb06d..065f1bd8479a 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1075,7 +1075,7 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 		    tmpl->mode == x->props.mode &&
 		    tmpl->id.proto == x->id.proto &&
 		    (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
-			xfrm_state_look_at(pol, x, fl, family,
+			xfrm_state_look_at(pol, x, fl, encap_family,
 					   &best, &acquire_in_progress, &error);
 	}
 	if (best || acquire_in_progress)
@@ -1092,7 +1092,7 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
 		    tmpl->mode == x->props.mode &&
 		    tmpl->id.proto == x->id.proto &&
 		    (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
-			xfrm_state_look_at(pol, x, fl, family,
+			xfrm_state_look_at(pol, x, fl, encap_family,
 					   &best, &acquire_in_progress, &error);
 	}
 
-- 
2.26.2