From: Jakub Kicinski
> Sent: 03 November 2020 00:01
>
> On Sat, 31 Oct 2020 18:40:28 +0100 Andrew Lunn wrote:
> > In function ‘strncpy’,
> > inlined from ‘sky2_name’ at drivers/net/ethernet/marvell/sky2.c:4903:3,
> > inlined from ‘sky2_probe’ at drivers/net/ethernet/marvell/sky2.c:5049:2:
> > ./include/linux/string.h:297:30: warning: ‘__builtin_strncpy’ specified
> > bound 16 equals destination
> size [-Wstringop-truncation]
> >
> > None of the device names are 16 characters long, so it was never an
> > issue, but reduce the length of the buffer size by one to avoid the
> > warning.
> >
> > Signed-off-by: Andrew Lunn <[email protected]>
> > ---
> > drivers/net/ethernet/marvell/sky2.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/marvell/sky2.c
> > b/drivers/net/ethernet/marvell/sky2.c
> > index 25981a7a43b5..35b0ec5afe13 100644
> > --- a/drivers/net/ethernet/marvell/sky2.c
> > +++ b/drivers/net/ethernet/marvell/sky2.c
> > @@ -4900,7 +4900,7 @@ static const char *sky2_name(u8 chipid, char *buf,
> > int sz)
> > };
> >
> > if (chipid >= CHIP_ID_YUKON_XL && chipid <= CHIP_ID_YUKON_OP_2)
> > - strncpy(buf, name[chipid - CHIP_ID_YUKON_XL], sz);
> > + strncpy(buf, name[chipid - CHIP_ID_YUKON_XL], sz - 1);
>
> Hm. This irks the eye a little. AFAIK the idiomatic code would be:
>
> strncpy(buf, name..., sz - 1);
> buf[sz - 1] = '\0';
>
> Perhaps it's easier to convert to strscpy()/strscpy_pad()?
>
> > else
> > snprintf(buf, sz, "(chip %#x)", chipid);
> > return buf;
Is the pad needed?
It isn't present in the 'else' branch.
David
-
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