[PATCH 5.10 91/96] phonet: Pass ifindex to fill_addr().

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kuniyuki Iwashima <kuniyu@amazon.com>

[ Upstream commit 08a9572be36819b5d9011604edfa5db6c5062a7a ]

We will convert addr_doit() and getaddr_dumpit() to RCU, both
of which call fill_addr().

The former will call phonet_address_notify() outside of RCU
due to GFP_KERNEL, so dev will not be available in fill_addr().

Let's pass ifindex directly to fill_addr().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Stable-dep-of: 71de0177b28d ("net: phonet: free phonet_device after RCU grace period")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/phonet/pn_netlink.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

--- a/net/phonet/pn_netlink.c
+++ b/net/phonet/pn_netlink.c
@@ -19,7 +19,7 @@
 
 /* Device address handling */
 
-static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
+static int fill_addr(struct sk_buff *skb, u32 ifindex, u8 addr,
 		     u32 portid, u32 seq, int event);
 
 void phonet_address_notify(int event, struct net_device *dev, u8 addr)
@@ -31,7 +31,8 @@ void phonet_address_notify(int event, st
 			nla_total_size(1), GFP_KERNEL);
 	if (skb == NULL)
 		goto errout;
-	err = fill_addr(skb, dev, addr, 0, 0, event);
+
+	err = fill_addr(skb, dev->ifindex, addr, 0, 0, event);
 	if (err < 0) {
 		WARN_ON(err == -EMSGSIZE);
 		kfree_skb(skb);
@@ -92,8 +93,8 @@ static int addr_doit(struct sk_buff *skb
 	return err;
 }
 
-static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
-			u32 portid, u32 seq, int event)
+static int fill_addr(struct sk_buff *skb, u32 ifindex, u8 addr,
+		     u32 portid, u32 seq, int event)
 {
 	struct ifaddrmsg *ifm;
 	struct nlmsghdr *nlh;
@@ -107,7 +108,7 @@ static int fill_addr(struct sk_buff *skb
 	ifm->ifa_prefixlen = 0;
 	ifm->ifa_flags = IFA_F_PERMANENT;
 	ifm->ifa_scope = RT_SCOPE_LINK;
-	ifm->ifa_index = dev->ifindex;
+	ifm->ifa_index = ifindex;
 	if (nla_put_u8(skb, IFA_LOCAL, addr))
 		goto nla_put_failure;
 	nlmsg_end(skb, nlh);
@@ -140,7 +141,7 @@ static int getaddr_dumpit(struct sk_buff
 			if (addr_idx++ < addr_start_idx)
 				continue;
 
-			if (fill_addr(skb, pnd->netdev, addr << 2,
+			if (fill_addr(skb, pnd->netdev->ifindex, addr << 2,
 					 NETLINK_CB(cb->skb).portid,
 					cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
 				goto out;