From ea9884b3acf3311c8a11db67bfab21773f6f82ba Mon Sep 17 00:00:00 2001 From: Fan Du Date: Mon, 16 Dec 2013 18:47:48 +0800 Subject: [PATCH] xfrm: check user specified spi for IPComp IPComp connection between two hosts is broken if given spi bigger than 0xffff. OUTSPI=0x87 INSPI=0x11112 ip xfrm policy update dst 192.168.1.101 src 192.168.1.109 dir out action allow \ tmpl dst 192.168.1.101 src 192.168.1.109 proto comp spi $OUTSPI ip xfrm policy update src 192.168.1.101 dst 192.168.1.109 dir in action allow \ tmpl src 192.168.1.101 dst 192.168.1.109 proto comp spi $INSPI ip xfrm state add src 192.168.1.101 dst 192.168.1.109 proto comp spi $INSPI \ comp deflate ip xfrm state add dst 192.168.1.101 src 192.168.1.109 proto comp spi $OUTSPI \ comp deflate tcpdump can capture outbound ping packet, but inbound packet is dropped with XfrmOutNoStates errors. It looks like spi value used for IPComp is expected to be 16bits wide only. Signed-off-by: Fan Du Signed-off-by: Steffen Klassert --- net/xfrm/xfrm_user.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 16c84608e81e..4027c4266a87 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -181,7 +181,9 @@ static int verify_newsa_info(struct xfrm_usersa_info *p, attrs[XFRMA_ALG_AEAD] || attrs[XFRMA_ALG_CRYPT] || attrs[XFRMA_ALG_COMP] || - attrs[XFRMA_TFCPAD]) + attrs[XFRMA_TFCPAD] || + (ntohl(p->id.spi) >= 0x10000)) + goto out; break;