clk: samsung: Fix out-of-bound access of of_match_node()

Currently, there is no terminator entry for exynosautov920_cmu_of_match,
hence facing below KASAN warning,

	BUG: KASAN: global-out-of-bounds in of_match_node+0x120/0x13c
	Read of size 1 at addr ffffffe31cc9e628 by task swapper/0/1

	CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.11.0+ #334
	Hardware name: linux,dummy-virt (DT)
	Call trace:
	 dump_backtrace+0x94/0xec
	 show_stack+0x18/0x24
	 dump_stack_lvl+0x90/0xd0
	 print_report+0x1f4/0x5b4
	 kasan_report+0xc8/0x110
	 __asan_report_load1_noabort+0x20/0x2c
	 of_match_node+0x120/0x13c
	 of_match_device+0x70/0xb4
	 platform_match+0xa0/0x25c
	 __device_attach_driver+0x7c/0x2d4
	 bus_for_each_drv+0x100/0x188
	 __device_attach+0x174/0x364
	 device_initial_probe+0x14/0x20
	 bus_probe_device+0x128/0x158
	 device_add+0xb3c/0x10fc
	 of_device_add+0xdc/0x150
	 of_platform_device_create_pdata+0x120/0x20c
	 of_platform_bus_create+0x2bc/0x620
	 of_platform_populate+0x58/0x108
	 of_platform_default_populate_init+0x100/0x120
	 do_one_initcall+0x110/0x788
	 kernel_init_freeable+0x44c/0x61c
	 kernel_init+0x24/0x1e4
	 ret_from_fork+0x10/0x20

	The buggy address belongs to the variable:
	 exynosautov920_cmu_of_match+0xc8/0x2c80

Add a dummy terminator entry at the end to assist of_match_node() in
traversing up to the terminator entry without accessing an
out-of-boundary index.

Fixes: 485e13fe2fb6 ("clk: samsung: add top clock support for ExynosAuto v920 SoC")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20240927102104.3268790-1-ruanjinjie@huawei.com
[krzk: drop trailing comma]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

diff --git a/drivers/clk/samsung/clk-exynosautov920.c b/drivers/clk/samsung/clk-exynosautov920.c
index 7ba9748c0526afd0f6492a5a3d7123e4eb79d689..f60f0a0c598de596fccbfd61e19ba8b4d0ab3d0d 100644 (file)
--- a/drivers/clk/samsung/clk-exynosautov920.c
+++ b/drivers/clk/samsung/clk-exynosautov920.c
@@ -1155,6 +1155,7 @@ static const struct of_device_id exynosautov920_cmu_of_match[] = {
                .compatible = "samsung,exynosautov920-cmu-peric0",
                .data = &peric0_cmu_info,
        },
+       { }
 };
 
 static struct platform_driver exynosautov920_cmu_driver __refdata = {