Re: [PATCH 13/22] liquidio: fix possible eeprom format string overflow

[David Miller]

From: Arnd Bergmann <arnd@xxxxxxxx>
Date: Fri, 14 Jul 2017 14:07:05 +0200

> gcc reports that the temporary buffer for computing the
> string length may be too small here:
> 
> drivers/net/ethernet/cavium/liquidio/lio_ethtool.c: In function 'lio_get_eeprom_len':
> /drivers/net/ethernet/cavium/liquidio/lio_ethtool.c:345:21: error: 'sprintf' may write a terminating nul past the end of the destination [-Werror=format-overflow=]
>   len = sprintf(buf, "boardname:%s serialnum:%s maj:%lld min:%lld\n",
>                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/ethernet/cavium/liquidio/lio_ethtool.c:345:6: note: 'sprintf' output between 35 and 167 bytes into a destination of size 128
>   len = sprintf(buf, "boardname:%s serialnum:%s maj:%lld min:%lld\n",
> 
> This extends it to 192 bytes, which is certainly enough. As far
> as I could tell, there are no other constraints that require a specific
> maximum size.
> 
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Applied.