Revision 84811412464d66fcf73661a279aa1d7985166495 authored by Prashant Malani on 20 November 2019, 19:40:21 UTC, committed by David S. Miller on 20 November 2019, 20:48:13 UTC
Both rtl_work_func_t() and rtl8152_close() call napi_disable(). Since the two calls aren't protected by a lock, if the close function starts executing before the work function, we can get into a situation where the napi_disable() function is called twice in succession (first by rtl8152_close(), then by set_carrier()). In such a situation, the second call would loop indefinitely, since rtl8152_close() doesn't call napi_enable() to clear the NAPI_STATE_SCHED bit. The rtl8152_close() function in turn issues a cancel_delayed_work_sync(), and so it would wait indefinitely for the rtl_work_func_t() to complete. Since rtl8152_close() is called by a process holding rtnl_lock() which is requested by other processes, this eventually leads to a system deadlock and crash. Re-order the napi_disable() call to occur after the work function disabling and urb cancellation calls are issued. Change-Id: I6ef0b703fc214998a037a68f722f784e1d07815e Reported-by: http://crbug.com/1017928 Signed-off-by: Prashant Malani <pmalani@chromium.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent b172845
init.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
*/
#include <linux/module.h>
#include <linux/init.h>
#include "autofs_i.h"
static struct dentry *autofs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return mount_nodev(fs_type, flags, data, autofs_fill_super);
}
struct file_system_type autofs_fs_type = {
.owner = THIS_MODULE,
.name = "autofs",
.mount = autofs_mount,
.kill_sb = autofs_kill_sb,
};
MODULE_ALIAS_FS("autofs");
MODULE_ALIAS("autofs");
static int __init init_autofs_fs(void)
{
int err;
autofs_dev_ioctl_init();
err = register_filesystem(&autofs_fs_type);
if (err)
autofs_dev_ioctl_exit();
return err;
}
static void __exit exit_autofs_fs(void)
{
autofs_dev_ioctl_exit();
unregister_filesystem(&autofs_fs_type);
}
module_init(init_autofs_fs)
module_exit(exit_autofs_fs)
MODULE_LICENSE("GPL");
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