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Message-Id: <1720520570-9904-2-git-send-email-ashwin.kamat@broadcom.com>
Date: Tue, 9 Jul 2024 15:52:49 +0530
From: Ashwin Kamat <ashwin.kamat@...adcom.com>
To: linux-kernel@...r.kernel.org
Cc: gregkh@...uxfoundation.org,
davem@...emloft.net,
yoshfuji@...ux-ipv6.org,
dsahern@...nel.org,
kuba@...nel.org,
netdev@...r.kernel.org,
florian.fainelli@...adcom.com,
ajay.kaher@...adcom.com,
vasavi.sirnapalli@...adcom.com,
tapas.kundu@...adcom.com,
ashwin.kamat@...adcom.com,
Eric Dumazet <edumazet@...gle.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH v5.10 1/2] net/ipv6: annotate data-races around cnf.disable_ipv6
From: Eric Dumazet <edumazet@...gle.com>
[Upstream commit d289ab65b89c1d4d88417cb6c03e923f21f95fae]
disable_ipv6 is read locklessly, add appropriate READ_ONCE()
and WRITE_ONCE() annotations.
v2: do not preload net before rtnl_trylock() in
addrconf_disable_ipv6() (Jiri)
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Stable-dep-of: 4db783d68b9b ("ipv6: prevent NULL dereference in ip6_output()")
Signed-off-by: Sasha Levin <sashal@...nel.org>
[Ashwin: Regenerated the Patch for v5.10]
Signed-off-by: Ashwin Dayanand Kamat <ashwin.kamat@...adcom.com>
---
net/ipv6/addrconf.c | 9 +++++----
net/ipv6/ip6_input.c | 2 +-
net/ipv6/ip6_output.c | 2 +-
3 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 8a6f4cdd5..ac09d4543 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4107,7 +4107,7 @@ static void addrconf_dad_work(struct work_struct *w)
if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
ipv6_addr_equal(&ifp->addr, &addr)) {
/* DAD failed for link-local based on MAC */
- idev->cnf.disable_ipv6 = 1;
+ WRITE_ONCE(idev->cnf.disable_ipv6, 1);
pr_info("%s: IPv6 being disabled!\n",
ifp->idev->dev->name);
@@ -6220,7 +6220,8 @@ static void addrconf_disable_change(struct net *net, __s32 newf)
idev = __in6_dev_get(dev);
if (idev) {
int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
- idev->cnf.disable_ipv6 = newf;
+
+ WRITE_ONCE(idev->cnf.disable_ipv6, newf);
if (changed)
dev_disable_change(idev);
}
@@ -6237,7 +6238,7 @@ static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
net = (struct net *)table->extra2;
old = *p;
- *p = newf;
+ WRITE_ONCE(*p, newf);
if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
rtnl_unlock();
@@ -6245,7 +6246,7 @@ static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
}
if (p == &net->ipv6.devconf_all->disable_ipv6) {
- net->ipv6.devconf_dflt->disable_ipv6 = newf;
+ WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
addrconf_disable_change(net, newf);
} else if ((!newf) ^ (!old))
dev_disable_change((struct inet6_dev *)table->extra1);
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 4eb9fbfdc..8cf5b10ee 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -165,7 +165,7 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
__IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_IN, skb->len);
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
- !idev || unlikely(idev->cnf.disable_ipv6)) {
+ !idev || unlikely(READ_ONCE(idev->cnf.disable_ipv6))) {
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
goto drop;
}
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 4126be15e..2b55bf0d3 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -240,7 +240,7 @@ int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
skb->protocol = htons(ETH_P_IPV6);
skb->dev = dev;
- if (unlikely(idev->cnf.disable_ipv6)) {
+ if (unlikely(READ_ONCE(idev->cnf.disable_ipv6))) {
IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
kfree_skb(skb);
return 0;
--
2.45.1
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