netdev - Re: [PATCH net] icmp: prevent possible NULL dereferences from icmp_build

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Message-ID: <20240419064552.5dbe33e6@kernel.org>
Date: Fri, 19 Apr 2024 06:45:52 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Paolo Abeni
 <pabeni@...hat.com>, netdev@...r.kernel.org, David Ahern
 <dsahern@...nel.org>, eric.dumazet@...il.com, Andreas Roeseler
 <andreas.a.roeseler@...il.com>
Subject: Re: [PATCH net] icmp: prevent possible NULL dereferences from
 icmp_build_probe()

On Fri, 19 Apr 2024 10:53:32 +0000 Eric Dumazet wrote:
> +	in6_dev = __in6_dev_get(dev);
> +	if (in6_dev && !list_empty(&in6_dev->addr_list))

There's got to be some conditional include somewhere because this seems
to break cut-down builds (presumably IPv6=n):

net/ipv4/icmp.c: In function ‘icmp_build_probe’:
net/ipv4/icmp.c:1125:19: error: implicit declaration of function ‘__in6_dev_get’; did you mean ‘in_dev_get’? [-Werror=implicit-function-declaration]
 1125 |         in6_dev = __in6_dev_get(dev);
      |                   ^~~~~~~~~~~~~
      |                   in_dev_get
net/ipv4/icmp.c:1125:17: error: assignment to ‘struct inet6_dev *’ from ‘int’ makes pointer from integer without a cast [-Werror=int-conversion]
 1125 |         in6_dev = __in6_dev_get(dev);
      |                 ^
-- 
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