linux-kernel - Re: [PATCH] nfc/nci: Fix uninit-value issue in nci_ntf

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Message-ID: <d4ba554d-213a-4961-a9f2-6582b38fc082@kernel.org>
Date: Wed, 16 Oct 2024 09:58:53 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Qianqiang Liu <qianqiang.liu@....com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com,
 syzkaller-bugs@...glegroups.com,
 syzbot+3f8fa0edaa75710cd66e@...kaller.appspotmail.com
Subject: Re: [PATCH] nfc/nci: Fix uninit-value issue in nci_ntf_packet

On 12/10/2024 20:47, Qianqiang Liu wrote:
> When an unsupported rf_tech_and_mode (0xe6) occurs in nci_rf_discover_ntf_packet,
> the ntf.ntf_type may be assigned an uninitialized value.
> 
> To resolve this, use the __GFP_ZERO flag when calling alloc_skb(),
> ensuring that skb->data is properly initialized.
> 
> Reported-by: syzbot+3f8fa0edaa75710cd66e@...kaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=3f8fa0edaa75710cd66e
> Tested-by: syzbot+3f8fa0edaa75710cd66e@...kaller.appspotmail.com
> Signed-off-by: Qianqiang Liu <qianqiang.liu@....com>

Do not attach (thread) your patchsets to some other threads (unrelated
or older versions). This buries them deep in the mailbox and might
interfere with applying entire sets.

> ---
>  drivers/nfc/virtual_ncidev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/nfc/virtual_ncidev.c b/drivers/nfc/virtual_ncidev.c
> index 6b89d596ba9a..31da26287327 100644
> --- a/drivers/nfc/virtual_ncidev.c
> +++ b/drivers/nfc/virtual_ncidev.c
> @@ -117,7 +117,7 @@ static ssize_t virtual_ncidev_write(struct file *file,
>  	struct virtual_nci_dev *vdev = file->private_data;
>  	struct sk_buff *skb;
>  
> -	skb = alloc_skb(count, GFP_KERNEL);
> +	skb = alloc_skb(count, GFP_KERNEL | __GFP_ZERO);
>  	if (!skb)
>  		return -ENOMEM;

Same comments as before:

https://lore.kernel.org/all/20240803121817.383567-1-zhanghao1@kylinos.cn/

Respond to existing feedback, please.

Best regards,
Krzysztof