netdev - Re: [PATCH net] net: mctp: Don't access ifa

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Message-ID: <20250506175830.15aefdbb@kernel.org>
Date: Tue, 6 May 2025 17:58:30 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Simon Horman <horms@...nel.org>
Cc: Matt Johnston <matt@...econstruct.com.au>, Jeremy Kerr
 <jk@...econstruct.com.au>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 netdev@...r.kernel.org,
 syzbot+e76d52dadc089b9d197f@...kaller.appspotmail.com,
 syzbot+1065a199625a388fce60@...kaller.appspotmail.com
Subject: Re: [PATCH net] net: mctp: Don't access ifa_index when missing

On Tue, 6 May 2025 17:07:53 +0100 Simon Horman wrote:
> > +	if (cb->nlh->nlmsg_len >= nlmsg_msg_size(sizeof(*hdr))) {
> > +		hdr = nlmsg_data(cb->nlh);  
> 
> FWIIW, I think the scope of the declaration of hdr can be reduced to this block.
> (Less positive ease, so to speak.)

We wouldn't be able to sizeof(*hdr) if we move it?

I have a different request :) Matt, once this ends up in net-next
(end of this week) could you refactor it to use nlmsg_payload() ?
It doesn't exist in net but this is exactly why it was added.