linux-kernel - [PATCH] clk: imx: Fix an out-of-bounds access in dispmix_csr_clk_dev

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Message-ID: <20250614112255.2838154-1-xiaolei.wang@windriver.com>
Date: Sat, 14 Jun 2025 19:22:55 +0800
From: Xiaolei Wang <xiaolei.wang@...driver.com>
To: abelvesa@...nel.org, peng.fan@....com, mturquette@...libre.com,
        sboyd@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com
Cc: xiaolei.wang@...driver.com, linux-clk@...r.kernel.org, imx@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] clk: imx: Fix an out-of-bounds access in dispmix_csr_clk_dev_data

When num_parents is 4, __clk_register() occurs an out-of-bounds
when accessing parent_names member.

 BUG: KASAN: global-out-of-bounds in __clk_register+0x1844/0x20d8
 Read of size 8 at addr ffff800086988e78 by task kworker/u24:3/59
  Hardware name: NXP i.MX95 19X19 board (DT)
  Workqueue: events_unbound deferred_probe_work_func
  Call trace:
    dump_backtrace+0x94/0xec
    show_stack+0x18/0x24
    dump_stack_lvl+0x8c/0xcc
    print_report+0x398/0x5fc
    kasan_report+0xd4/0x114
    __asan_report_load8_noabort+0x20/0x2c
    __clk_register+0x1844/0x20d8
    clk_hw_register+0x44/0x110
    __clk_hw_register_mux+0x284/0x3a8
    imx95_bc_probe+0x4f4/0xa70

Fixes: 5224b189462f ("clk: imx: add i.MX95 BLK CTL clk driver")
Signed-off-by: Xiaolei Wang <xiaolei.wang@...driver.com>
---
 drivers/clk/imx/clk-imx95-blk-ctl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/imx/clk-imx95-blk-ctl.c b/drivers/clk/imx/clk-imx95-blk-ctl.c
index 25974947ad0c..fd11932b12b3 100644
--- a/drivers/clk/imx/clk-imx95-blk-ctl.c
+++ b/drivers/clk/imx/clk-imx95-blk-ctl.c
@@ -223,7 +223,7 @@ static const struct imx95_blk_ctl_clk_dev_data dispmix_csr_clk_dev_data[] = {
 	[IMX95_CLK_DISPMIX_ENG0_SEL] = {
 		.name = "disp_engine0_sel",
 		.parent_names = (const char *[]){"videopll1", "dsi_pll", "ldb_pll_div7", },
-		.num_parents = 4,
+		.num_parents = 3,
 		.reg = 0,
 		.bit_idx = 0,
 		.bit_width = 2,
@@ -233,7 +233,7 @@ static const struct imx95_blk_ctl_clk_dev_data dispmix_csr_clk_dev_data[] = {
 	[IMX95_CLK_DISPMIX_ENG1_SEL] = {
 		.name = "disp_engine1_sel",
 		.parent_names = (const char *[]){"videopll1", "dsi_pll", "ldb_pll_div7", },
-		.num_parents = 4,
+		.num_parents = 3,
 		.reg = 0,
 		.bit_idx = 2,
 		.bit_width = 2,
-- 
2.43.0