lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Sat, 22 Aug 2020 09:45:13 -0600
From:   David Ahern <>
To:     Nikolay Aleksandrov <>,
Subject: Re: [PATCH net v2] net: nexthop: don't allow empty NHA_GROUP

On 8/22/20 6:06 AM, Nikolay Aleksandrov wrote:
> Currently the nexthop code will use an empty NHA_GROUP attribute, but it
> requires at least 1 entry in order to function properly. Otherwise we
> end up derefencing null or random pointers all over the place due to not
> having any nh_grp_entry members allocated, nexthop code relies on having at
> least the first member present. Empty NHA_GROUP doesn't make any sense so
> just disallow it.
> Also add a WARN_ON for any future users of nexthop_create_group().


> CC: David Ahern <>
> Fixes: 430a049190de ("nexthop: Add support for nexthop groups")
> Reported-by:
> Signed-off-by: Nikolay Aleksandrov <>
> ---
> Tested on 5.3 and latest -net by adding a nexthop with an empty NHA_GROUP
> (purposefully broken iproute2) and then adding a route which uses it.
> v2: no changes, include stack trace in commit message
>  net/ipv4/nexthop.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

Reviewed-by: David Ahern <>

Thanks, Nik

Powered by blists - more mailing lists