| Message ID | 20170714120720.906842-23-arnd@arndb.de (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
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 <arnd@arndb.de> > --- > drivers/infiniband/hw/mlx4/sysfs.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Thanks, Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
diff --git a/drivers/infiniband/hw/mlx4/sysfs.c b/drivers/infiniband/hw/mlx4/sysfs.c index 0ba5ba7540c8..e219093d2764 100644 --- a/drivers/infiniband/hw/mlx4/sysfs.c +++ b/drivers/infiniband/hw/mlx4/sysfs.c @@ -221,7 +221,7 @@ void del_sysfs_port_mcg_attr(struct mlx4_ib_dev *device, int port_num, static int add_port_entries(struct mlx4_ib_dev *device, int port_num) { int i; - char buff[10]; + char buff[11]; struct mlx4_ib_iov_port *port = NULL; int ret = 0 ; struct ib_port_attr attr;
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 <arnd@arndb.de> --- drivers/infiniband/hw/mlx4/sysfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)