linux-kernel - Re: [PATCH] stm class: Fix out of bound access from bitmap allocation

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Date:   Sun, 7 Apr 2019 10:01:23 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     David Laight <David.Laight@...LAB.COM>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mulu He <muluhe@...eaurora.org>,
        Tingwei Zhang <tingwei@...eaurora.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>
Cc:     Rajendra Nayak <rnayak@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] stm class: Fix out of bound access from bitmap allocation

On 4/5/2019 6:44 PM, David Laight wrote:
> From: Sai Prakash Ranjan
>>
>> diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
>> index 93ce3aa740a9..21a5838f6e67 100644
>> --- a/drivers/hwtracing/stm/core.c
>> +++ b/drivers/hwtracing/stm/core.c
>> @@ -168,7 +168,7 @@ static int stp_master_alloc(struct stm_device *stm, unsigned int idx)
>>   	struct stp_master *master;
>>   	size_t size;
>>
>> -	size = ALIGN(stm->data->sw_nchannels, 8) / 8;
>> +	size = ALIGN(stm->data->sw_nchannels, STM_MASTER_SZ) / STM_MASTER_SZ;
> 
> I'm not sure that using STP_MASTER_SZ improves readability at all.
> 

I thought it was better to have a macro than directly specifying
sizeof(unsigned long), anyways I can change it.

> Is there something that gives the size of a bitmap for 'n' items?
> 

Not sure if there is something.

Thanks,
Sai

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