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Message-ID: <6674f2cd-53bc-bb9a-931e-d4dde6ef01e8@huawei.com> Date: Thu, 16 May 2019 10:51:15 +0800 From: hujunwei <hujunwei4@...wei.com> To: <jon.maloy@...csson.com>, <ying.xue@...driver.com>, <davem@...emloft.net> CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, <tipc-discussion@...ts.sourceforge.net>, <mingfangsen@...wei.com>, <wangxiaogang3@...wei.com>, <wangwang2@...wei.com> Subject: [PATCH] tipc: switch order of device registration to fix a crash From: Junwei Hu <hujunwei4@...wei.com> When tipc is loaded while many processes try to create a TIPC socket, a crash occurs: PANIC: Unable to handle kernel paging request at virtual address "dfff20000000021d" pc : tipc_sk_create+0x374/0x1180 [tipc] lr : tipc_sk_create+0x374/0x1180 [tipc] Exception class = DABT (current EL), IL = 32 bits Call trace: tipc_sk_create+0x374/0x1180 [tipc] __sock_create+0x1cc/0x408 __sys_socket+0xec/0x1f0 __arm64_sys_socket+0x74/0xa8 ... This is due to race between sock_create and unfinished register_pernet_device. tipc_sk_insert tries to do "net_generic(net, tipc_net_id)". but tipc_net_id is not initialized yet. So switch the order of the two to close the race. This can be reproduced with multiple processes doing socket(AF_TIPC, ...) and one process doing module removal. Fixes: a62fbccecd62 ("tipc: make subscriber server support net namespace") Signed-off-by: Junwei Hu <hujunwei4@...wei.com> Reported-by: Wang Wang <wangwang2@...wei.com> Reviewed-by: Xiaogang Wang <wangxiaogang3@...wei.com> --- net/tipc/core.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/net/tipc/core.c b/net/tipc/core.c index 5b38f5164281..dbfc1e8b2866 100644 --- a/net/tipc/core.c +++ b/net/tipc/core.c @@ -129,10 +129,6 @@ static int __init tipc_init(void) if (err) goto out_netlink_compat; - err = tipc_socket_init(); - if (err) - goto out_socket; - err = tipc_register_sysctl(); if (err) goto out_sysctl; @@ -141,6 +137,10 @@ static int __init tipc_init(void) if (err) goto out_pernet; + err = tipc_socket_init(); + if (err) + goto out_socket; + err = tipc_bearer_setup(); if (err) goto out_bearer; @@ -148,12 +148,12 @@ static int __init tipc_init(void) pr_info("Started in single node mode\n"); return 0; out_bearer: + tipc_socket_stop(); +out_socket: unregister_pernet_subsys(&tipc_net_ops); out_pernet: tipc_unregister_sysctl(); out_sysctl: - tipc_socket_stop(); -out_socket: tipc_netlink_compat_stop(); out_netlink_compat: tipc_netlink_stop(); @@ -165,10 +165,10 @@ static int __init tipc_init(void) static void __exit tipc_exit(void) { tipc_bearer_cleanup(); + tipc_socket_stop(); unregister_pernet_subsys(&tipc_net_ops); tipc_netlink_stop(); tipc_netlink_compat_stop(); - tipc_socket_stop(); tipc_unregister_sysctl(); pr_info("Deactivated\n"); -- 2.21.GIT
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