Re: [Qemu-devel] [PATCH 1/5] 9pfs: check return value of v9fs_co_name_to_path()

[Greg Kurz]

On Fri, 5 May 2017 11:55:43 -0500
Eric Blake <address@hidden> wrote:

> On 05/05/2017 09:37 AM, Greg Kurz wrote:
> > These v9fs_co_name_to_path() call sites have always been around. I guess
> > no care was taken to check the return value because the name_to_path
> > operation could never fail at the time. This is no longer true: the
> > handle and synth backends can already fail this operation, and so will the
> > local backend soon.
> > 
> > Signed-off-by: Greg Kurz <address@hidden>
> > ---
> >  hw/9pfs/9p.c |   36 +++++++++++++++++++++++++-----------
> >  1 file changed, 25 insertions(+), 11 deletions(-)
> >   
> 
> > @@ -2588,8 +2591,11 @@ static int coroutine_fn v9fs_complete_rename(V9fsPDU 
> > *pdu, V9fsFidState *fidp,
> >          new_name = g_malloc0(end - old_name + name->size + 1);
> >          strncat(new_name, old_name, end - old_name);
> >          strncat(new_name + (end - old_name), name->data, name->size);  
> 
> Ad long as you're here, you could replace this strncat mess with the
> shorter:
> 
> new_name = g_strdup_printf("%.*s%.*s", end - old_name, old_name,
>                            name->size, name->data);
> 
> (or with further simplifications if you have NUL-terminated data).  But
> that can be a separate cleanup.
> 

Yes you're right, this definitely looks better than the strncat() logic.
I guess I'll do this in a separate patch.

Thanks for the suggestion.

> Reviewed-by: Eric Blake <address@hidden>
>

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