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xfrm: Fix xfrm_input() to verify state is valid when (encap_type < 0)

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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: 7785bba299 ("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>
This commit is contained in:
Aviv Heller 2017-11-28 19:55:40 +02:00 committed by Steffen Klassert
parent e719135881
commit 4ce3dbe397
1 changed files with 11 additions and 1 deletions
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12
net/xfrm/xfrm_input.c
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@ -207,7 +207,7 @@ 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;
@ -216,6 +216,16 @@ 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. */