linux-kernel - Re: [PATCH net] tun: Add missing bpf_net_ctx_clear() in do_xdp

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Message-Id: <20240727022803.4809-1-aha310510@gmail.com>
Date: Sat, 27 Jul 2024 11:28:03 +0900
From: Jeongjun Park <aha310510@...il.com>
To: aha310510@...il.com
Cc: ast@...nel.org,
	bigeasy@...utronix.de,
	bpf@...r.kernel.org,
	daniel@...earbox.net,
	davem@...emloft.net,
	edumazet@...gle.com,
	hawk@...nel.org,
	jasowang@...hat.com,
	john.fastabend@...il.com,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	syzbot+44623300f057a28baf1e@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com,
	willemdebruijn.kernel@...il.com,
	syzbot+c226757eb784a9da3e8b@...kaller.appspotmail.com,
	syzbot+61a1cfc2b6632363d319@...kaller.appspotmail.com,
	syzbot+709e4c85c904bcd62735@...kaller.appspotmail.com
Subject: Re: [PATCH net] tun: Add missing bpf_net_ctx_clear() in do_xdp_generic()

On Fri, 26 Jul 2024 06:40:49 +0900 Jeongjun Park wrote:
> There are cases where do_xdp_generic returns bpf_net_context without
> clearing it. This causes various memory corruptions, so the missing
> bpf_net_ctx_clear must be added.
>
> Reported-by: syzbot+44623300f057a28baf1e@...kaller.appspotmail.com
> Fixes: fecef4cd42c6 ("tun: Assign missing bpf_net_context.")
> Signed-off-by: Jeongjun Park <aha310510@...il.com>

Reported-by: syzbot+c226757eb784a9da3e8b@...kaller.appspotmail.com
Reported-by: syzbot+61a1cfc2b6632363d319@...kaller.appspotmail.com
Reported-by: syzbot+709e4c85c904bcd62735@...kaller.appspotmail.com

After searching, I found reports with the same root cause, so I added
them.