linux-kernel - Re: [PATCH V2 next] keys/dns: fix slab-out-of-bounds in dns_resolver

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Message-ID: <20231216210632.GW6288@kernel.org>
Date: Sat, 16 Dec 2023 21:06:32 +0000
From: Simon Horman <horms@...nel.org>
To: Edward Adam Davis <eadavis@...com>
Cc: davem@...emloft.net, dhowells@...hat.com, edumazet@...gle.com,
	jarkko@...nel.org, jmorris@...ei.org, keyrings@...r.kernel.org,
	kuba@...nel.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, netdev@...r.kernel.org,
	pabeni@...hat.com, paul@...l-moore.com, serge@...lyn.com,
	syzbot+94bbb75204a05da3d89f@...kaller.appspotmail.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH V2 next] keys/dns: fix slab-out-of-bounds in
 dns_resolver_preparse

On Thu, Dec 14, 2023 at 10:46:10PM +0800, Edward Adam Davis wrote:
> bin will be forcibly converted to "struct dns_server_list_v1_header *", so it 
> is necessary to compare datalen with sizeof(*v1).
> 
> Fixes: b946001d3bb1 ("keys, dns: Allow key types (eg. DNS) to be reclaimed immediately on expiry")
> Reported-and-tested-by: syzbot+94bbb75204a05da3d89f@...kaller.appspotmail.com
> Signed-off-by: Edward Adam Davis <eadavis@...com>
> ---
>  net/dns_resolver/dns_key.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

This change looks correct to me.
And I agree that it addresses a problem introduced by the cited commit.
I also note that it depends on the cited commit, which is not present in net.

Reviewed-by: Simon Horman <horms@...nel.org>