Re: [PATCH] net: rtnetlink: bail out from rtnl_fdb_dump() on parse error
From: David Miller
Date: Wed May 24 2017 - 15:32:33 EST
From: Alexander Potapenko <glider@xxxxxxxxxx>
Date: Tue, 23 May 2017 13:20:28 +0200
> rtnl_fdb_dump() failed to check the result of nlmsg_parse(), which led
> to contents of |ifm| being uninitialized because nlh->nlmsglen was too
> small to accommodate |ifm|. The uninitialized data may affect some
> branches and result in unwanted effects, although kernel data doesn't
> seem to leak to the userspace directly.
>
> The bug has been detected with KMSAN and syzkaller.
>
> Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
Applied, thanks.