linux-kernel - Re: [PATCH] net: ipv6: fix slab-out-of-bounda Read in xfrm6_tunnel_alloc

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Message-Id: <20200728.172910.1838346370661943435.davem@davemloft.net>
Date:   Tue, 28 Jul 2020 17:29:10 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     bkkarthik@...u.pes.edu
Cc:     steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, skhan@...uxfoundation.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH] net: ipv6: fix slab-out-of-bounda Read in
 xfrm6_tunnel_alloc_spi

From: B K Karthik <bkkarthik@...u.pes.edu>
Date: Sat, 25 Jul 2020 18:15:53 +0530

> fix slab-out-of-bounds Read in xfrm6_tunnel_alloc_spi
> by checking for existance of head for the list spi_byspi

spi_byspi is an array, therefore as long as xfrm6_tn is not NULL
then spi_byspi will also not be NULL.