linux-kernel - Re: [PATCH v3] x86/xen: Add some null pointer checking to smp.c

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Date: Fri, 19 Jan 2024 11:40:48 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Kunwu Chan <chentao@...inos.cn>, xen-devel@...ts.xenproject.org,
 kernel-janitors@...r.kernel.org, Boris Ostrovsky
 <boris.ostrovsky@...cle.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>,
 Ingo Molnar <mingo@...hat.com>, Jürgen Groß
 <jgross@...e.com>, Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Cc: kernel test robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] x86/xen: Add some null pointer checking to smp.c

> kasprintf() returns a pointer to dynamically allocated memory
> which can be NULL upon failure. Ensure the allocation was successful
> by checking the pointer validity.
…
> ---
> Changes in v3:
>     - Remove rc initialization
>     - Simply error paths by adding a new label 'fail_mem'
…

I became curious if you would like to simplify further source code places.

> +++ b/arch/x86/xen/smp.c
> @@ -65,6 +65,8 @@ int xen_smp_intr_init(unsigned int cpu)
>  	char *resched_name, *callfunc_name, *debug_name;
>
>  	resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
> +	if (!resched_name)
> +		goto fail_mem;

Would you like to add a blank line after such a statement?

>  	per_cpu(xen_resched_irq, cpu).name = resched_name;
…

Please compare with your subsequent suggestion.

…
> @@ -101,6 +108,9 @@ int xen_smp_intr_init(unsigned int cpu)
>  	}
>
>  	callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
> +	if (!callfunc_name)
> +		goto fail_mem;
> +
>  	per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
…

Regards,
Markus