Re: [Qemu-devel] [PATCH 06/15] sheepdog: Don't truncate long VDI name in _open(), _create()

[Markus Armbruster <armbru@redhat.com>]

Philippe Mathieu-Daudé <f4bug@amsat.org> writes:

> On 03/02/2017 08:32 PM, Eric Blake wrote:
>> On 03/02/2017 03:43 PM, Markus Armbruster wrote:
>>> sd_parse_uri() truncates long VDI names silently.  Reject them
>>> instead.
>>>
>>> Signed-off-by: Markus Armbruster <armbru@redhat.com>
>>> ---
>>>  block/sheepdog.c | 4 +++-
>>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/block/sheepdog.c b/block/sheepdog.c
>>> index deb110e..72a52a6 100644
>>> --- a/block/sheepdog.c
>>> +++ b/block/sheepdog.c
>>> @@ -985,7 +985,9 @@ static int sd_parse_uri(BDRVSheepdogState *s, const char *filename,
>>>          ret = -EINVAL;
>>>          goto out;
>>>      }
>>> -    pstrcpy(vdi, SD_MAX_VDI_LEN, uri->path + 1);
>>> +    if (g_strlcpy(vdi, uri->path + 1, SD_MAX_VDI_LEN) >= SD_MAX_VDI_LEN) {
>>> +        goto out;
>>> +    }
>>
>> Does this need to set ret? Maybe to -EINVAL?
>>
>
> ups I missed that. what about -ENAMETOOLONG?
> bdrv callers seem to only test for 'ret < 0'.

The next patch gets rid of the error code in this function.

>>>
>>>      qp = query_params_parse(uri->query);
>>>      if (qp->n > 1 || (s->is_unix && !qp->n) || (!s->is_unix && qp->n)) {
>>>
>>