linux-kernel - Re: [PATCH] intel_th: core: fix null pointer dereference in intel_th

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Message-ID: <b1046b7f-817e-47b5-830d-71b1f9a9b4f0@redhat.com>
Date: Mon, 29 Sep 2025 08:05:17 -0400
From: David Arcari <darcari@...hat.com>
To: Markus Elfring <Markus.Elfring@....de>, kernel-janitors@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jerry Hoemann <jerry.hoemann@....com>
Subject: Re: [PATCH] intel_th: core: fix null pointer dereference in
 intel_th_irq


Hi Markus,

On 9/27/25 10:54 AM, Markus Elfring wrote:
> …
>> +++ b/drivers/hwtracing/intel_th/core.c
>> @@ -715,7 +715,9 @@ intel_th_subdevice_alloc(struct intel_th *th,
>>   int intel_th_output_enable(struct intel_th *th, unsigned int otype)
>>   {
>>   	struct intel_th_device *thdev;
>> -	int src = 0, dst = 0;
>> +	int src = 0, dst = 0, ret = 0;
>> +
>> +	disable_irq(th->irq);
> …
>> -	return 0;
>> +	enable_irq(th->irq);
>> +	return ret;
>>   }
> …
> 
> How do you think about to increase the application of scope-based resource management?
> https://elixir.bootlin.com/linux/v6.17-rc7/source/include/linux/interrupt.h#L239-L240

At this point, I think that Alex is the best person to handle the 
resolution of this issue.

Best,
-DA

> 
> Regards,
> Markus
>