linux-kernel - Re: [PATCH] thunderbolt: xdomain: Fix to check return value of kmemdup

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Date:   Wed, 20 Mar 2019 17:48:55 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     David Laight <David.Laight@...LAB.COM>,
        'Aditya Pakki' <pakki001@....edu>
Cc:     "kjlu@....edu" <kjlu@....edu>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "xdp-newbies@...r.kernel.org" <xdp-newbies@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: Re: [PATCH] thunderbolt: xdomain: Fix to check return value of
 kmemdup


On 3/20/2019 4:27 PM, David Laight wrote:
> From: Aditya Pakki
>> Sent: 18 March 2019 22:55
>>
>> kmemdup can fail and return a NULL pointer. The patch modifies the
>> signature of tb_xdp_schedule_request and passes the failure error upstream.
>>
>> Signed-off-by: Aditya Pakki <pakki001@....edu>
>> ---
>>   drivers/thunderbolt/xdomain.c | 10 ++++++----
>>   1 file changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
>> index e27dd8beb94b..b0e9cc30d708 100644
>> --- a/drivers/thunderbolt/xdomain.c
>> +++ b/drivers/thunderbolt/xdomain.c
>> @@ -526,7 +526,7 @@ static void tb_xdp_handle_request(struct work_struct *work)
>>   	kfree(xw);
>>   }
>>
>> -static void
>> +static bool
>>   tb_xdp_schedule_request(struct tb *tb, const struct tb_xdp_header *hdr,
>>   			size_t size)
>>   {
>> @@ -534,13 +534,16 @@ tb_xdp_schedule_request(struct tb *tb, const struct tb_xdp_header *hdr,
>>
>>   	xw = kmalloc(sizeof(*xw), GFP_KERNEL);
>>   	if (!xw)
>> -		return;
>> +		return false;
>>
>>   	INIT_WORK(&xw->work, tb_xdp_handle_request);
>>   	xw->pkg = kmemdup(hdr, size, GFP_KERNEL);
>> +	if (!xw->pkg)
>> +		return false;
> You're leaking 'xw' here.


Yes , Clean up is missing otherwise patch looks good.

Mukesh

>
> 	David
>
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
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