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ipv4: use RCU protection in inet_select_addr()

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[ Upstream commit 719817cd293e4fa389e1f69c396f3f816ed5aa41 ]

inet_select_addr() must use RCU protection to make
sure the net structure it reads does not disappear.

Fixes: c4544c7243 ("[NETNS]: Process inet_select_addr inside a namespace.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250205155120.1676781-7-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet 2025-02-05 15:51:14 +00:00 • committed by Greg Kroah-Hartman
commit 8cc8e1285a
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/devinet.c
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@ -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;