4.14-stable review patch. If anyone has any objections, please let me know.
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From: Christophe JAILLET christophe.jaillet@wanadoo.fr
commit d7f393430a17c2bfcdf805462a5aa80be4285b27 upstream.
In order to be sure that 'buff' is never truncated, its size should be 12, not 11.
When building with W=1, this fixes the following warnings:
drivers/infiniband/hw/mlx4/sysfs.c: In function ‘add_port_entries’: drivers/infiniband/hw/mlx4/sysfs.c:268:34: error: ‘sprintf’ may write a terminating nul past the end of the destination [-Werror=format-overflow=] 268 | sprintf(buff, "%d", i); | ^ drivers/infiniband/hw/mlx4/sysfs.c:268:17: note: ‘sprintf’ output between 2 and 12 bytes into a destination of size 11 268 | sprintf(buff, "%d", i); | ^~~~~~~~~~~~~~~~~~~~~~ drivers/infiniband/hw/mlx4/sysfs.c:286:34: error: ‘sprintf’ may write a terminating nul past the end of the destination [-Werror=format-overflow=] 286 | sprintf(buff, "%d", i); | ^ drivers/infiniband/hw/mlx4/sysfs.c:286:17: note: ‘sprintf’ output between 2 and 12 bytes into a destination of size 11 286 | sprintf(buff, "%d", i); | ^~~~~~~~~~~~~~~~~~~~~~
Fixes: c1e7e466120b ("IB/mlx4: Add iov directory in sysfs under the ib device") Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Link: https://lore.kernel.org/r/0bb1443eb47308bc9be30232cc23004c4d4cf43e.169544853... Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/infiniband/hw/mlx4/sysfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- 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 static int add_port_entries(struct mlx4_ib_dev *device, int port_num) { int i; - char buff[11]; + char buff[12]; struct mlx4_ib_iov_port *port = NULL; int ret = 0 ; struct ib_port_attr attr;