linux-kernel - Re: [PATCH net v2] liquidio: Fix potential null pointer dereference

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Date: Fri, 22 Mar 2024 15:43:37 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Aleksandr Mishin <amishin@...rgos.ru>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Kees Cook
 <keescook@...omium.org>, Justin Stitt <justinstitt@...gle.com>, Felix
 Manlunas <felix.manlunas@...ium.com>, Satanand Burla
 <satananda.burla@...ium.com>, Raghu Vatsavayi <raghu.vatsavayi@...ium.com>,
 Vijaya Mohan Guvva <vijaya.guvva@...ium.com>, <netdev@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <lvc-project@...uxtesting.org>
Subject: Re: [PATCH net v2] liquidio: Fix potential null pointer dereference

On Fri, 22 Mar 2024 22:57:44 +0300 Aleksandr Mishin wrote:
> In lio_vf_rep_copy_packet() pg_info->page is compared to a NULL value,
> but then it is unconditionally passed to skb_add_rx_frag() which could
> lead to null pointer dereference.
> Fix this bug by moving skb_add_rx_frag() into conditional scope.

The explanation should tell us how the bug can happen, i.e. what
sequence of events leads to null-deref. Not what logic your tool
matched on, perhaps the NULL check is unnecessary.
-- 
pw-bot: cr