From: David Laight <david.laight.linux@gmail.com>
To: Syed Tayyab Farooq <syedtayyabfarooq08@gmail.com>
Cc: netdev@vger.kernel.org,
syzbot+0e665e4b99cb925286a0@syzkaller.appspotmail.com,
Syed Tayyab Farooq <tayyabfarooq1997@outlook.com>
Subject: Re: [PATCH] memset skb to zero to avoid uninit value error from KMSAN
Date: Sun, 7 Dec 2025 17:54:42 +0000 [thread overview]
Message-ID: <20251207175442.7d5ea387@pumpkin> (raw)
In-Reply-To: <20251207162109.113159-1-tayyabfarooq1997@outlook.com>
On Mon, 8 Dec 2025 00:20:52 +0800
Syed Tayyab Farooq <syedtayyabfarooq08@gmail.com> wrote:
> Signed-off-by: Syed Tayyab Farooq <tayyabfarooq1997@outlook.com>
> ---
>
> Hi syzbot,
>
> Please test this patch.
>
> #syz test: https://syzkaller.appspot.com/bug?extid=0e665e4b99cb925286a0
>
> 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);
That looks entirely broken.
Did you try running it?
David
> +
> if (phonet_address_lookup(dev_net(dev), pn_addr(dst)) == 0)
> skb->pkt_type = PACKET_LOOPBACK;
>
prev parent reply other threads:[~2025-12-07 17:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-07 16:20 [PATCH] memset skb to zero to avoid uninit value error from KMSAN Syed Tayyab Farooq
2025-12-07 16:21 ` syzbot
2025-12-07 17:54 ` David Laight [this message]
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