[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240324224720.1345309-154-sashal@kernel.org>
Date: Sun, 24 Mar 2024 18:37:59 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Eric Dumazet <edumazet@...gle.com>,
Guillaume Nault <gnault@...hat.com>,
Kuniyuki Iwashima <kuniyu@...zon.com>,
Willem de Bruijn <willemb@...gle.com>,
Paolo Abeni <pabeni@...hat.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.7 153/713] inet_diag: annotate data-races around inet_diag_table[]
From: Eric Dumazet <edumazet@...gle.com>
[ Upstream commit e50e10ae5d81ddb41547114bfdc5edc04422f082 ]
inet_diag_lock_handler() reads inet_diag_table[proto] locklessly.
Use READ_ONCE()/WRITE_ONCE() annotations to avoid potential issues.
Fixes: d523a328fb02 ("[INET]: Fix inet_diag dead-lock regression")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reviewed-by: Guillaume Nault <gnault@...hat.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@...zon.com>
Reviewed-by: Willem de Bruijn <willemb@...gle.com>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
net/ipv4/inet_diag.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 7d0e7aaa71e0a..5f7fdbd01cf9b 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -57,7 +57,7 @@ static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
return ERR_PTR(-ENOENT);
}
- if (!inet_diag_table[proto])
+ if (!READ_ONCE(inet_diag_table[proto]))
sock_load_diag_module(AF_INET, proto);
mutex_lock(&inet_diag_table_mutex);
@@ -1419,7 +1419,7 @@ int inet_diag_register(const struct inet_diag_handler *h)
mutex_lock(&inet_diag_table_mutex);
err = -EEXIST;
if (!inet_diag_table[type]) {
- inet_diag_table[type] = h;
+ WRITE_ONCE(inet_diag_table[type], h);
err = 0;
}
mutex_unlock(&inet_diag_table_mutex);
@@ -1436,7 +1436,7 @@ void inet_diag_unregister(const struct inet_diag_handler *h)
return;
mutex_lock(&inet_diag_table_mutex);
- inet_diag_table[type] = NULL;
+ WRITE_ONCE(inet_diag_table[type], NULL);
mutex_unlock(&inet_diag_table_mutex);
}
EXPORT_SYMBOL_GPL(inet_diag_unregister);
--
2.43.0
Powered by blists - more mailing lists