linux-kernel - Re: [PATCH] memset skb to zero to avoid uninit value error from KMSAN

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Message-ID: <6935a981.a70a0220.38f243.0064.GAE@google.com>
Date: Sun, 07 Dec 2025 08:21:21 -0800
From: syzbot <syzbot+0e665e4b99cb925286a0@...kaller.appspotmail.com>
To: syedtayyabfarooq08@...il.com
Cc: netdev@...r.kernel.org, syedtayyabfarooq08@...il.com, 
	tayyabfarooq1997@...look.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] memset skb to zero to avoid uninit value error from KMSAN

> Signed-off-by: Syed Tayyab Farooq <tayyabfarooq1997@...look.com>
> ---
>
> Hi syzbot,
>
> Please test this patch.
>
> #syz test: https://syzkaller.appspot.com/bug?extid=0e665e4b99cb925286a0

This crash does not have a reproducer. I cannot test it.

>
> Thanks,
> Tayyab
>
>
>  net/phonet/af_phonet.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
> index a27efa4faa4e..9279decd680b 100644
> --- a/net/phonet/af_phonet.c
> +++ b/net/phonet/af_phonet.c
> @@ -208,6 +208,8 @@ static int pn_raw_send(const void *data, int len, struct net_device *dev,
>  	if (skb == NULL)
>  		return -ENOMEM;
>  
> +	memset(skb, 0, MAX_PHONET_HEADER + len);
> +
>  	if (phonet_address_lookup(dev_net(dev), pn_addr(dst)) == 0)
>  		skb->pkt_type = PACKET_LOOPBACK;
>  
> -- 
> 2.43.0
>