netdev - [PATCH net-next] rtnetlink: Move nesting cancellation rollback to proper function

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Date: Thu, 13 Jul 2023 17:16:52 +0300
From: Gal Pressman <gal@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>
CC: <netdev@...r.kernel.org>, Paolo Abeni <pabeni@...hat.com>, Eric Dumazet
	<edumazet@...gle.com>, Gal Pressman <gal@...dia.com>
Subject: [PATCH net-next] rtnetlink: Move nesting cancellation rollback to proper function

Make rtnl_fill_vf() cancel the vfinfo attribute on error instead of the
inner rtnl_fill_vfinfo(), as it is the function that starts it.

Signed-off-by: Gal Pressman <gal@...dia.com>
---
 net/core/rtnetlink.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 3ad4e030846d..ed9b41ab9afc 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1343,7 +1343,7 @@ static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
 	vf_trust.setting = ivi.trusted;
 	vf = nla_nest_start_noflag(skb, IFLA_VF_INFO);
 	if (!vf)
-		goto nla_put_vfinfo_failure;
+		return -EMSGSIZE;
 	if (nla_put(skb, IFLA_VF_MAC, sizeof(vf_mac), &vf_mac) ||
 	    nla_put(skb, IFLA_VF_BROADCAST, sizeof(vf_broadcast), &vf_broadcast) ||
 	    nla_put(skb, IFLA_VF_VLAN, sizeof(vf_vlan), &vf_vlan) ||
@@ -1414,8 +1414,6 @@ static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
 
 nla_put_vf_failure:
 	nla_nest_cancel(skb, vf);
-nla_put_vfinfo_failure:
-	nla_nest_cancel(skb, vfinfo);
 	return -EMSGSIZE;
 }
 
@@ -1441,8 +1439,10 @@ static noinline_for_stack int rtnl_fill_vf(struct sk_buff *skb,
 		return -EMSGSIZE;
 
 	for (i = 0; i < num_vfs; i++) {
-		if (rtnl_fill_vfinfo(skb, dev, i, vfinfo, ext_filter_mask))
+		if (rtnl_fill_vfinfo(skb, dev, i, vfinfo, ext_filter_mask)) {
+			nla_nest_cancel(skb, vfinfo);
 			return -EMSGSIZE;
+		}
 	}
 
 	nla_nest_end(skb, vfinfo);
-- 
2.40.1