From 38369f54d97dd7dc50c73a2797bfeb53c2e87d2d Mon Sep 17 00:00:00 2001 From: Steffen Klassert Date: Thu, 31 May 2018 09:45:18 +0200 Subject: xfrm Fix potential error pointer dereference in xfrm_bundle_create. We may derference an invalid pointer in the error path of xfrm_bundle_create(). Fix this by returning this error pointer directly instead of assigning it to xdst0. Fixes: 45b018beddb6 ("ipsec: Create and use new helpers for dst child access.") Signed-off-by: Steffen Klassert --- net/xfrm/xfrm_policy.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'net/xfrm') diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 40b54cc64243..5f48251c1319 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1658,7 +1658,6 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, trailer_len -= xdst_prev->u.dst.xfrm->props.trailer_len; } -out: return &xdst0->u.dst; put_states: @@ -1667,8 +1666,8 @@ put_states: free_dst: if (xdst0) dst_release_immediate(&xdst0->u.dst); - xdst0 = ERR_PTR(err); - goto out; + + return ERR_PTR(err); } static int xfrm_expand_policies(const struct flowi *fl, u16 family, -- cgit v1.2.3-59-g8ed1b