This is a note to let you know that I've just added the patch titled
ipv6: mcast: add RCU protection to mld_newpack()
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipv6-mcast-add-rcu-protection-to-mld_newpack.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d068448361a4775dc0449560d4ebbd7a866a2ffc
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Wed Feb 12 14:10:21 2025 +0000
ipv6: mcast: add RCU protection to mld_newpack()
[ Upstream commit a527750d877fd334de87eef81f1cb5f0f0ca3373 ]
mld_newpack() can be called without RTNL or RCU being held.
Note that we no longer can use sock_alloc_send_skb() because
ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.
Instead use alloc_skb() and charge the net->ipv6.igmp_sk
socket under RCU protection.
Fixes: b8ad0cbc58f7 ("[NETNS][IPV6] mcast - handle several network namespace")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Reviewed-by: David Ahern <dsahern@xxxxxxxxxx>
Link: https://patch.msgid.link/20250212141021.1663666-1-edumazet@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index a777695389403..a1b3f3e7921fa 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1731,21 +1731,19 @@ static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
struct net_device *dev = idev->dev;
int hlen = LL_RESERVED_SPACE(dev);
int tlen = dev->needed_tailroom;
- struct net *net = dev_net(dev);
const struct in6_addr *saddr;
struct in6_addr addr_buf;
struct mld2_report *pmr;
struct sk_buff *skb;
unsigned int size;
struct sock *sk;
- int err;
+ struct net *net;
- sk = net->ipv6.igmp_sk;
/* we assume size > sizeof(ra) here
* Also try to not allocate high-order pages for big MTU
*/
size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
- skb = sock_alloc_send_skb(sk, size, 1, &err);
+ skb = alloc_skb(size, GFP_KERNEL);
if (!skb)
return NULL;
@@ -1753,6 +1751,12 @@ static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
skb_reserve(skb, hlen);
skb_tailroom_reserve(skb, mtu, tlen);
+ rcu_read_lock();
+
+ net = dev_net_rcu(dev);
+ sk = net->ipv6.igmp_sk;
+ skb_set_owner_w(skb, sk);
+
if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
/* <draft-ietf-magma-mld-source-05.txt>:
* use unspecified address as the source address
@@ -1764,6 +1768,8 @@ static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
+ rcu_read_unlock();
+
skb_put_data(skb, ra, sizeof(ra));
skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
