This is a note to let you know that I've just added the patch titled
ipv4: use RCU protection in inet_select_addr()
to the 5.4-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:
ipv4-use-rcu-protection-in-inet_select_addr.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit dffd10aa1dace313c447d5bf86109032bff4e72c
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Wed Feb 5 15:51:14 2025 +0000
ipv4: use RCU protection in inet_select_addr()
[ Upstream commit 719817cd293e4fa389e1f69c396f3f816ed5aa41 ]
inet_select_addr() must use RCU protection to make
sure the net structure it reads does not disappear.
Fixes: c4544c724322 ("[NETNS]: Process inet_select_addr inside a namespace.")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Link: https://patch.msgid.link/20250205155120.1676781-7-edumazet@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 9910844c890ba..6855372d57a34 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1317,10 +1317,11 @@ __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
__be32 addr = 0;
unsigned char localnet_scope = RT_SCOPE_HOST;
struct in_device *in_dev;
- struct net *net = dev_net(dev);
+ struct net *net;
int master_idx;
rcu_read_lock();
+ net = dev_net_rcu(dev);
in_dev = __in_dev_get_rcu(dev);
if (!in_dev)
goto no_in_dev;
