linux-kernel - [PATCH 5.4 007/158] ipv6: Fix error path to cancel the meseage

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Date:   Mon, 23 Nov 2020 13:20:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Zhang Qilong <zhangqilong3@...wei.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.4 007/158] ipv6: Fix error path to cancel the meseage

From: Zhang Qilong <zhangqilong3@...wei.com>

[ Upstream commit ceb736e1d45c253f5e86b185ca9b497cdd43063f ]

genlmsg_cancel() needs to be called in the error path of
inet6_fill_ifmcaddr and inet6_fill_ifacaddr to cancel
the message.

Fixes: 6ecf4c37eb3e ("ipv6: enable IFA_TARGET_NETNSID for RTM_GETADDR")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Zhang Qilong <zhangqilong3@...wei.com>
Link: https://lore.kernel.org/r/20201112080950.1476302-1-zhangqilong3@huawei.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/addrconf.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4984,8 +4984,10 @@ static int inet6_fill_ifmcaddr(struct sk
 		return -EMSGSIZE;
 
 	if (args->netnsid >= 0 &&
-	    nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
+	    nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
+		nlmsg_cancel(skb, nlh);
 		return -EMSGSIZE;
+	}
 
 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
 	if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
@@ -5016,8 +5018,10 @@ static int inet6_fill_ifacaddr(struct sk
 		return -EMSGSIZE;
 
 	if (args->netnsid >= 0 &&
-	    nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
+	    nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
+		nlmsg_cancel(skb, nlh);
 		return -EMSGSIZE;
+	}
 
 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
 	if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||