From: Aviv Heller <avivh@mellanox.com>
Date: Tue, 28 Nov 2017 19:55:40 +0200
Subject: xfrm: Fix xfrm_input() to verify state is valid when (encap_type < 0)
Patch-mainline: v4.15-rc6
Git-commit: 4ce3dbe397d7b6b15f272ae757c78c35e9e4b61d
References: bsc#1076830
Code path when (encap_type < 0) does not verify the state is valid
before progressing.
This will result in a crash if, for instance, x->km.state ==
XFRM_STATE_ACQ.
Fixes: 7785bba299a8 ("esp: Add a software GRO codepath")
Signed-off-by: Aviv Heller <avivh@mellanox.com>
Signed-off-by: Yevgeny Kliteynik <kliteyn@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Michal Kubecek <mkubecek@suse.cz>
---
net/xfrm/xfrm_input.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 9de4b1dbc0ae..f2f7ad03cc3d 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -206,7 +206,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
xfrm_address_t *daddr;
struct xfrm_mode *inner_mode;
u32 mark = skb->mark;
- unsigned int family;
+ unsigned int family = AF_UNSPEC;
int decaps = 0;
int async = 0;
bool xfrm_gro = false;
@@ -215,6 +215,16 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
if (encap_type < 0) {
x = xfrm_input_state(skb);
+
+ if (unlikely(x->km.state != XFRM_STATE_VALID)) {
+ if (x->km.state == XFRM_STATE_ACQ)
+ XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
+ else
+ XFRM_INC_STATS(net,
+ LINUX_MIB_XFRMINSTATEINVALID);
+ goto drop;
+ }
+
family = x->outer_mode->afinfo->family;
/* An encap_type of -1 indicates async resumption. */
--
2.15.1