On Fri, Jul 14, 2017 at 02:07:14PM +0200, Arnd Bergmann wrote: > gcc-7 points out that a negative port_num value would overflow > the string buffer: > > drivers/infiniband/hw/mlx4/sysfs.c: In function 'mlx4_ib_device_register_sysfs': > drivers/infiniband/hw/mlx4/sysfs.c:251:16: error: 'sprintf' may write a terminating nul past the end of the destination [-Werror=format-overflow=] > drivers/infiniband/hw/mlx4/sysfs.c:251:2: note: 'sprintf' output between 2 and 11 bytes into a destination of size 10 > drivers/infiniband/hw/mlx4/sysfs.c:303:17: error: 'sprintf' may write a terminating nul past the end of the destination [-Werror=format-overflow=] > drivers/infiniband/hw/mlx4/sysfs.c:303:3: note: 'sprintf' output between 2 and 11 bytes into a destination of size 10 > > While we should be able to assume that port_num is positive here, > making the buffer one byte longer has no downsides and avoids the > warning. > > Fixes: c1e7e466120b ("IB/mlx4: Add iov directory in sysfs under the ib device") > Signed-off-by: Arnd Bergmann > --- > drivers/infiniband/hw/mlx4/sysfs.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Thanks, Reviewed-by: Leon Romanovsky