Subject: Re: [PATCH net-next 0/2] netfilter: conntrack: validate parsed port values in IRC and Amanda helpers

From: Pablo Neira Ayuso <[email-masked]>
Date: Thu, 30 Apr 2026 18:18:11 +0200

On Thu, Apr 30, 2026 at 09:42:28PM +0530, HACKE-RC wrote:
> Both nf_conntrack_irc and nf_conntrack_amanda parse port numbers from
> application-layer protocol data using simple_strtoul(), which returns
> unsigned long. The results are stored in u16 variables without range
> checks, silently truncating values above 65535.
> 
> This series adds explicit upper-bound validation in both helpers.
> 
> Note: checkpatch warns about simple_strtoul being obsolete. Both
> call sites use the endptr output parameter to advance the parse
> position, which kstrtoul does not provide. Converting to kstrtoul
> would require restructuring the parsers, which is out of scope for
> this fix.
> 
> HACKE-RC (2):

HAHA, this nickname is funny, it is making my day here. Thanks!

>   netfilter: nf_conntrack_irc: reject DCC port values above 65535
>   netfilter: nf_conntrack_amanda: reject port values above 65535
> 
>  net/netfilter/nf_conntrack_amanda.c | 10 ++++++----
>  net/netfilter/nf_conntrack_irc.c    |  7 ++++++-
>  2 files changed, 12 insertions(+), 5 deletions(-)
> 
> -- 
> 2.54.0
>