linux-kernel - Re: [PATCH] net: mvpp2: fix possible invalid pointer dereference

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Message-ID: <0562e5c5-6c4e-4c61-f175-c06dad61b506@huawei.com>
Date:   Tue, 15 Nov 2022 16:50:42 +0800
From:   Hui Tang <tanghui20@...wei.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <mw@...ihalf.com>, <linux@...linux.org.uk>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yusongping@...wei.com>
Subject: Re: [PATCH] net: mvpp2: fix possible invalid pointer dereference



On 2022/11/15 16:42, Leon Romanovsky wrote:
> On Tue, Nov 15, 2022 at 12:46:32PM +0800, Hui Tang wrote:
>> It will cause invalid pointer dereference to priv->cm3_base behind,
>> if PTR_ERR(priv->cm3_base) in mvpp2_get_sram().
>>
>> Fixes: a59d354208a7 ("net: mvpp2: enable global flow control")
>> Signed-off-by: Hui Tang <tanghui20@...wei.com>
>> ---
>>  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
>> index d98f7e9a480e..c92bd1922421 100644
>> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
>> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
>> @@ -7421,7 +7421,7 @@ static int mvpp2_probe(struct platform_device *pdev)
>>  			dev_warn(&pdev->dev, "Fail to alloc CM3 SRAM\n");
>>
>>  		/* Enable global Flow Control only if handler to SRAM not NULL */
>> -		if (priv->cm3_base)
>> +		if (!IS_ERR_OR_NULL(priv->cm3_base))
>>  			priv->global_tx_fc = true;
>
> The change is ok, but the patch title should include target, in your
> case it is net -> [PATCH net] ....

Thanks, I will fix it in v2.