netdev - Re: [PATCH net-next v2 3/5] netconsole: add support for strings with new line in netpoll_parse_ip

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Message-ID: <ptspqvcgbwmyyyhtfhna3jsdzffvo2tffyl4mugkozvyen5oze@ek2i6q5kkgtq>
Date: Wed, 23 Jul 2025 10:37:59 -0700
From: Breno Leitao <leitao@...ian.org>
To: Simon Horman <horms@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH net-next v2 3/5] netconsole: add support for strings with
 new line in netpoll_parse_ip_addr

On Wed, Jul 23, 2025 at 03:54:11PM +0100, Simon Horman wrote:
> On Mon, Jul 21, 2025 at 06:02:03AM -0700, Breno Leitao wrote:

> > --- a/drivers/net/netconsole.c
> > +++ b/drivers/net/netconsole.c
> > @@ -303,20 +303,21 @@ static void netconsole_print_banner(struct netpoll *np)
> >  static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr)
> >  {
> >  	const char *end;
> > +	int len;
> >  
> > -	if (!strchr(str, ':') &&
> > -	    in4_pton(str, -1, (void *)addr, -1, &end) > 0) {
> > -		if (!*end)
> > -			return 0;
> > -	}
> > -	if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) {
> > -#if IS_ENABLED(CONFIG_IPV6)
> > -		if (!*end)
> > -			return 1;
> > -#else
> > +	len = strlen(str);
> > +	if (!len)
> >  		return -1;
> > +
> > +	if (str[len - 1] == '\n')
> > +		len -= 1;
> > +
> > +	if (in4_pton(str, len, (void *)addr, -1, &end) > 0)
> > +		return 0;
> > +#if IS_ENABLED(CONFIG_IPV6)
> > +	if (in6_pton(str, len, addr->in6.s6_addr, -1, &end) > 0)
> > +		return 1;
> >  #endif
> 
> I don't think it needs to block progress.
> But FWIIW, I think it would be nice to increase
> build coverage and express this as:

Agree. While testing with IPv6 disabled, the netcons selftest exploded,
so, this explose a bug in the selftest. This is now fixed in:

	https://lore.kernel.org/all/20250723-netcons_test_ipv6-v1-1-41c9092f93f9@debian.org/

Thanks for the review,
--breno