mfd: display-serdes: Fix out-of-bounds access issue

Checked with kasan, the buggy stacktrace:

BUG: KASAN: global-out-of-bounds in serdes_bridge_probe+0x2bc/0x568
Read of size 20 at addr ffffffc009a87240 by task swapper/0/1

CPU: 3 PID: 1 Comm: swapper/0 Tainted: G    B              6.1.84 khadas#7
Hardware name: Rockchip RK3576 VEHICLE EVB V20 MOS LINUX Board (DT)
Call trace:
 dump_backtrace+0x11c/0x128
 show_stack+0x1c/0x28
 dump_stack_lvl+0x64/0x7c
 print_report+0x150/0x498
 kasan_report+0x80/0xf0
 kasan_check_range+0xe8/0x198
 __asan_loadN+0x20/0x28
 serdes_bridge_probe+0x2bc/0x568
 platform_probe+0x90/0x108
 really_probe+0x118/0x548
 __driver_probe_device+0xc0/0x1f0
 driver_probe_device+0x60/0x168

Fixes: 563845b ("mfd: display-serdes: add serdes display driver support base on mfd arch")

Change-Id: Ib0f6a674d75e0f9861163b0803f327963c3a85e5
Signed-off-by: Cody Xie <[email protected]>

Author: Cody Xie

drivers/mfd/display-serdes/serdes-bridge.c

@@ -7,6 +7,8 @@
  * Author: luowei <[email protected]>
  */
 
+#include <linux/string.h>
+
 #include "core.h"
 
 static struct serdes_bridge *to_serdes_bridge(struct drm_bridge *bridge)
@@ -24,7 +26,7 @@ static struct mipi_dsi_device *serdes_attach_dsi(struct serdes_bridge *serdes_br
 	int ret;
 
 	if (serdes->chip_data->name)
-		memcpy(&info.type, serdes->chip_data->name, ARRAY_SIZE(info.type));
+		strscpy(info.type, serdes->chip_data->name, sizeof(info.type));
 
 	SERDES_DBG_MFD("%s: type=%s, name=%s\n", __func__,
 		       info.type, serdes->chip_data->name);