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SubjectRe: [PATCH 5/8] ntb_tool: BUG: Ensure the buffer size is large enough to return all spads
Ok, I'll add a comment.

Logan

On 10/06/16 08:35 PM, Allen Hubbe wrote:
> On Fri, Jun 10, 2016 at 6:54 PM, Logan Gunthorpe <logang@deltatee.com> wrote:
>> On hardware with 32 scratchpad registers the spad field in ntb tool
>> could chop off the end. The maximum buffer size is increased from
>> 256 to 15 times the number or scratchpads.
>>
>> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
>
> It could be marginally better if there was an explanation to accompany
> the magic number 15, but it's not a big deal. One might guess it has
> something to do with the expected length of the formatted string.
>
> Acked-by: Allen Hubbe <Allen.Hubbe@emc.com>
>
>> ---
>> drivers/ntb/test/ntb_tool.c | 5 +++--
>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
>> index 4c01057..954e1d5 100644
>> --- a/drivers/ntb/test/ntb_tool.c
>> +++ b/drivers/ntb/test/ntb_tool.c
>> @@ -368,7 +368,9 @@ static ssize_t tool_spadfn_read(struct tool_ctx *tc, char __user *ubuf,
>> if (!spad_read_fn)
>> return -EINVAL;
>>
>> - buf_size = min_t(size_t, size, 0x100);
>> + spad_count = ntb_spad_count(tc->ntb);
>> +
>> + buf_size = min_t(size_t, size, spad_count * 15);
>>
>> buf = kmalloc(buf_size, GFP_KERNEL);
>> if (!buf)
>> @@ -376,7 +378,6 @@ static ssize_t tool_spadfn_read(struct tool_ctx *tc, char __user *ubuf,
>>
>> pos = 0;
>>
>> - spad_count = ntb_spad_count(tc->ntb);
>> for (i = 0; i < spad_count; ++i) {
>> pos += scnprintf(buf + pos, buf_size - pos, "%d\t%#x\n",
>> i, spad_read_fn(tc->ntb, i));
>> --
>> 2.1.4
>>
>> --
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