firmware: ti_sci: fix strncat length check

gcc-7 notices that the length we pass to strncat is wrong:

drivers/firmware/ti_sci.c: In function 'ti_sci_probe':
drivers/firmware/ti_sci.c:204:32: error: specified bound 50 equals the size of the destination [-Werror=stringop-overflow=]

Instead of the total length, we must pass the length of the
remaining space here.

Fixes: aa276781a64a ("firmware: Add basic support for TI System Control Interface (TI-SCI) protocol")
Cc: stable@vger.kernel.org
Acked-by: Nishanth Menon <nm@ti.com>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index 874ff32db366..00cfed3c3e1a 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -202,7 +202,8 @@ static int ti_sci_debugfs_create(struct platform_device *pdev,
         info->debug_buffer[info->debug_region_size] = 0;
 
         info->d = debugfs_create_file(strncat(debug_name, dev_name(dev),
-                                              sizeof(debug_name)),
+                                              sizeof(debug_name) -
+                                              sizeof("ti_sci_debug@")),
                                       0444, NULL, info, &ti_sci_debug_fops);
         if (IS_ERR(info->d))
                 return PTR_ERR(info->d);