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List:       linux-doc
Subject:    Re: [PATCH V7 17/24] coresight: etb10: implementing AUX space API
From:       Mathieu Poirier <mathieu.poirier () linaro ! org>
Date:       2015-12-23 16:33:11
Message-ID: CANLsYkwgo0pQFAvdO+dbPxYUqqj0xWoa_i_RkX2bWJYv-UOvHg () mail ! gmail ! com
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On 19 December 2015 at 10:23, Rabin Vincent <rabin@rab.in> wrote:
> On Fri, Dec 18, 2015 at 01:59:13PM -0700, Mathieu Poirier wrote:
>> +static void etb_update_buffer(struct coresight_device *csdev,
>> +                           struct perf_output_handle *handle,
>> +                           void *sink_config)
>> +{
>> +     int i, cur;
>> +     u32 *buf_ptr;
>
> ...
>
>> +     for (i = 0; i < to_read; i += 4) {
>> +             buf_ptr = buf->data_pages[cur] + offset;
>> +             read_data = readl_relaxed(drvdata->base +
>> +                                       ETB_RAM_READ_DATA_REG);
>> +             *buf_ptr++ = read_data >> 0;
>> +             *buf_ptr++ = read_data >> 8;
>> +             *buf_ptr++ = read_data >> 16;
>> +             *buf_ptr++ = read_data >> 24;
>
> buf_ptr should either be changed to a u8* or just the first write should
> be present.  Otherwise this overwrites lots of memory.

Good catch!

>
>> +
>> +             offset += 4;
>> +             if (offset >= PAGE_SIZE) {
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