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

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Date: Sat, 9 Mar 2024 12:45:30 -0800
From: Kees Cook <keescook@...omium.org>
To: Simon Horman <horms@...nel.org>
Cc: Aleksandr Mishin <amishin@...rgos.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	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] liquidio: Fix potential null pointer dereference

On Fri, Mar 08, 2024 at 08:19:11PM +0000, Simon Horman wrote:
> On Thu, Mar 07, 2024 at 12:29:32PM +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.
> > 
> > Found by Linux Verification Center (linuxtesting.org) with SVACE.
> > 
> > Fixes: 1f233f327913 (liquidio: switchdev support for LiquidIO NIC)
> 
> A correct format for the tag above is:
> 
> Fixes: 1f233f327913 ("liquidio: switchdev support for LiquidIO NIC")

FWIW, I have this in my ~/.gitconfig[1]:

[alias]
        short = "!f() { for i in \"$@\"; do git log -1 --pretty='%h (\"%s\")' \"$i\"; done; }; f"


then I can type:

$ short 1f233f327913f3dee0602cba9c64df1903772b55
1f233f327913 ("liquidio: switchdev support for LiquidIO NIC")


-Kees

[1] https://github.com/kees/kernel-tools/blob/trunk/ENVIRONMENT.md#git-command-aliases-gitconfig

-- 
Kees Cook