linux-kernel - Re: Re: [PATCH v2] drivers/hid/hid-multitouch.c: fix a possible null pointer access.

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Message-ID: <1576585687-10426-1-git-send-email-zhangpan26@huawei.com>
Date:   Tue, 17 Dec 2019 20:28:07 +0800
From:   Pan Zhang <zhangpan26@...wei.com>
To:     <zhangpan26@...wei.com>, <hushiyuan@...wei.com>,
        <jikos@...nel.org>, <benjamin.tissoires@...hat.com>,
        <rydberg@...math.org>
CC:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH v2] drivers/hid/hid-multitouch.c: fix a possible null pointer access.

On Tue, Dec 17, 2019 at 18:50 PM Benjamin Tissoires <benjamin.tissoires@...hat.com> wrote:

>Can you add at the beginning of your commit message:
>From: Pan Zhang <zhangpan26@...wei.com>
>
>This way we have the commit author that matches the signature, which is a requirement for the kernel.

Firstly, thanks for your reviewing very much. I would fix my signature.

>>  drivers/hid/hid-multitouch.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/hid/hid-multitouch.c 
>> b/drivers/hid/hid-multitouch.c index 3cfeb16..368de81 100644
>> --- a/drivers/hid/hid-multitouch.c
>> +++ b/drivers/hid/hid-multitouch.c
>> @@ -1019,7 +1019,7 @@ static int mt_process_slot(struct mt_device *td, struct input_dev *input,
>>                 tool = MT_TOOL_DIAL;
>>         else if (unlikely(!confidence_state)) {
>>                 tool = MT_TOOL_PALM;
>> -               if (!active &&
>> +               if (!active && mt

>Ack on the principle, but this doesn't even compile. You are missing a `&&` at the end of the line.
>
>Can you send a v2 with the comments above? And we will queue the v2 for 5.5 I think.

Sorry about that. I made a stupid mistake. This patch fixed it.

Signed-off-by: Pan Zhang <zhangpan26@...wei.com>
---
 drivers/hid/hid-multitouch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 3cfeb16..368de81 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -1019,7 +1019,7 @@ static int mt_process_slot(struct mt_device *td, struct input_dev *input,
 		tool = MT_TOOL_DIAL;
 	else if (unlikely(!confidence_state)) {
 		tool = MT_TOOL_PALM;
-		if (!active &&
+		if (!active && mt &&
 		    input_mt_is_active(&mt->slots[slotnum])) {
 			/*
 			 * The non-confidence was reported for
-- 
2.7.4