linux-kernel - Re: [PATCH] ARM: mvebu: Add check in coherency.c to prevent null pointer dereference

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Message-ID: <38bb64c0.1341f.18de06c41e0.Coremail.duoming@zju.edu.cn>
Date: Sun, 25 Feb 2024 21:20:07 +0800 (GMT+08:00)
From: duoming@....edu.cn
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	andrew@...n.ch, gregory.clement@...tlin.com,
	sebastian.hesselbarth@...il.com
Subject: Re: [PATCH] ARM: mvebu: Add check in coherency.c to prevent null
 pointer dereference

On Sun, 25 Feb 2024 11:30:20 +0000 Russell King (Oracle) wrote:
> > The kzalloc() in armada_375_380_coherency_init() will return
> > null if the physical memory has run out. As a result, if we
> > dereference the property pointer, the null pointer dereference
> > bug will happen.
> > 
> > This patch adds a check to avoid null pointer dereference.
> 
> Again, what if kstrdup() fails?

Thank you for your suggestions, I will also add a check to judge
whether kstrdup() fails.

Best regards,
Duoming Zhou