From aef21785995778f710a60b563e03bf53ba455a47 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Thu, 13 Dec 2007 09:30:59 -0800 Subject: [PATCH] [IPSEC]: Fix zero return value in xfrm_lookup on error Further testing shows that my ICMP relookup patch can cause xfrm_lookup to return zero on error which isn't very nice since it leads to the caller dying on null pointer dereference. The bug is due to not setting err to ENOENT just before we leave xfrm_lookup in case of no policy. This patch moves the err setting to where it should be. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/xfrm/xfrm_policy.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index a83b5e1349ed..8023a3c0dad5 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1469,8 +1469,6 @@ restart: goto dropdst; } - err = -ENOENT; - if (!policy) { /* To accelerate a bit... */ if ((dst_orig->flags & DST_NOXFRM) || @@ -1492,6 +1490,7 @@ restart: npols ++; xfrm_nr += pols[0]->xfrm_nr; + err = -ENOENT; if ((flags & XFRM_LOOKUP_ICMP) && !(policy->flags & XFRM_POLICY_ICMP)) goto error; @@ -1657,6 +1656,7 @@ dropdst: return err; nopol: + err = -ENOENT; if (flags & XFRM_LOOKUP_ICMP) goto dropdst; return 0; -- 2.20.1