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net: annotate data-races around cleanup_net_task

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from_cleanup_net() reads cleanup_net_task locklessly.

Add READ_ONCE()/WRITE_ONCE() annotations to avoid
a potential KCSAN warning, even if the race is harmless.

Fixes: 0734d7c3d9 ("net: expedite synchronize_net() for cleanup_net()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Link: https://patch.msgid.link/20250604093928.1323333-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2025-06-04 09:39:28 +00:00
committed by Jakub Kicinski
parent e6854be4d8
commit 535caaca92
2 changed files with 3 additions and 3 deletions
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2
net/core/dev.c
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@@ -10499,7 +10499,7 @@ static void dev_index_release(struct net *net, int ifindex)
static bool from_cleanup_net(void)
{
#ifdef CONFIG_NET_NS
return current == cleanup_net_task;
return current == READ_ONCE(cleanup_net_task);
#else
return false;
#endif