linux-kernel - Re: [PATCH] vme: Fix error not catched in fake

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Message-ID: <8f90dbbe-51b0-67c8-d6cb-3bd9c1d9d481@huawei.com>
Date:   Tue, 6 Dec 2022 09:53:38 +0800
From:   Chen Zhongjin <chenzhongjin@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <linux-staging@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
        <martyn@...chs.me.uk>, <manohar.vanga@...il.com>, <arnd@...db.de>
Subject: Re: [PATCH] vme: Fix error not catched in fake_init()

Hi,

On 2022/12/5 20:31, Greg KH wrote:
> On Mon, Dec 05, 2022 at 04:48:05PM +0800, Chen Zhongjin wrote:
>> In fake_init(), __root_device_register() is possible to fail but it's
>> ignored, which can cause unregistering vme_root fail when exit.
>>
>>   general protection fault,
>>   probably for non-canonical address 0xdffffc000000008c
>>   KASAN: null-ptr-deref in range [0x0000000000000460-0x0000000000000467]
>>   RIP: 0010:root_device_unregister+0x26/0x60
>>   Call Trace:
>>    <TASK>
>>    __x64_sys_delete_module+0x34f/0x540
>>    do_syscall_64+0x38/0x90
>>    entry_SYSCALL_64_after_hwframe+0x63/0xcd
>>
>> Return error when __root_device_register() fails.
>>
>> Fixes: 658bcdae9c67 ("vme: Adding Fake VME driver")
>> Signed-off-by: Chen Zhongjin <chenzhongjin@...wei.com>
>> ---
>>   drivers/staging/vme_user/vme_fake.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/staging/vme_user/vme_fake.c b/drivers/staging/vme_user/vme_fake.c
>> index dd646b0c531d..1ee432c223e2 100644
>> --- a/drivers/staging/vme_user/vme_fake.c
>> +++ b/drivers/staging/vme_user/vme_fake.c
>> @@ -1073,6 +1073,8 @@ static int __init fake_init(void)
>>   
>>   	/* We need a fake parent device */
>>   	vme_root = __root_device_register("vme", THIS_MODULE);
> This should be calling root_device_register() as well, not this version
> of the call.
Of course it should. Have sent another patch for it.

Thanks for your time!
Chen
> thanks,
>
> greg k-h