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can: proc: can_remove_proc(): silence remove_proc_entry warning

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commit 3accbfdc36130282f5ae9e6eecfdf820169fedce upstream.

If can_init_proc() fail to create /proc/net/can directory, can_remove_proc()
will trigger a warning:

WARNING: CPU: 6 PID: 7133 at fs/proc/generic.c:672 remove_proc_entry+0x17b0
Kernel panic - not syncing: panic_on_warn set ...

Fix to return early from can_remove_proc() if can proc_dir does not exists.

Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Link: https://lore.kernel.org/r/1594709090-3203-1-git-send-email-zhangchangzhong@huawei.com
Fixes: 8e8cda6d73 ("can: initial support for network namespaces")
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhang Changzhong 2020-07-14 14:44:50 +08:00 committed by Greg Kroah-Hartman
parent 1527ab7859
commit 7ae6f2df43
1 changed files with 4 additions and 2 deletions
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6
net/can/proc.c
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@ -471,6 +471,9 @@ void can_init_proc(struct net *net)
*/
void can_remove_proc(struct net *net)
{
if (!net->can.proc_dir)
return;
if (net->can.pde_version)
remove_proc_entry(CAN_PROC_VERSION, net->can.proc_dir);
@ -498,6 +501,5 @@ void can_remove_proc(struct net *net)
if (net->can.pde_rcvlist_sff)
remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir);
if (net->can.proc_dir)
remove_proc_entry("can", net->proc_net);
remove_proc_entry("can", net->proc_net);
}