From bce7698e2e6565bb765bd0522337f29f5f312624 Mon Sep 17 00:00:00 2001 From: Haojie Li Date: Tue, 25 Aug 2026 18:08:45 +0800 Subject: drm/mediatek: Add missing IS_ERR check for ovl_adaptor platform device platform_device_register_data() can fail and return an ERR_PTR, but the return value is used without checking, leading to an invalid pointer being stored in ddp_comp[].dev and passed to component_match_add() and mtk_ddp_comp_init(), which could result in a kernel crash. Add an IS_ERR() check to jump to the error handling path on failure. Fixes: 0d9eee9118b7 ("drm/mediatek: Add drm ovl_adaptor sub driver for MT8195") Cc: stable@vger.kernel.org Signed-off-by: Haojie Li Reviewed-by: CK Hu Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260825100845.438893-1-lihaojie@kylinos.cn/ Signed-off-by: Chun-Kuang Hu --- lib/Kconfig.kmsan | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 lib/Kconfig.kmsan (limited to 'lib/Kconfig.kmsan') diff --git a/lib/Kconfig.kmsan b/lib/Kconfig.kmsan new file mode 100644 index 000000000..cae1ddcc1 --- /dev/null +++ b/lib/Kconfig.kmsan @@ -0,0 +1,54 @@ +# SPDX-License-Identifier: GPL-2.0-only +config HAVE_ARCH_KMSAN + bool + +config HAVE_KMSAN_COMPILER + def_bool $(cc-option,-fsanitize=kernel-memory) + +config KMSAN + bool "KMSAN: detector of uninitialized values use" + depends on HAVE_ARCH_KMSAN && HAVE_KMSAN_COMPILER + depends on DEBUG_KERNEL && !KASAN && !KCSAN + depends on !PREEMPT_RT + select STACKDEPOT + select STACKDEPOT_ALWAYS_INIT + help + KernelMemorySanitizer (KMSAN) is a dynamic detector of uses of + uninitialized values in the kernel. It is based on compiler + instrumentation provided by Clang and thus requires Clang to build. + + An important note is that KMSAN is not intended for production use, + because it drastically increases kernel memory footprint and slows + the whole system down. + + See for more details. + +if KMSAN + +config KMSAN_CHECK_PARAM_RETVAL + bool "Check for uninitialized values passed to and returned from functions" + default y + help + If the compiler supports -fsanitize-memory-param-retval, KMSAN will + eagerly check every function parameter passed by value and every + function return value. + + Disabling KMSAN_CHECK_PARAM_RETVAL will result in tracking shadow for + function parameters and return values across function borders. This + is a more relaxed mode, but it generates more instrumentation code and + may potentially report errors in corner cases when non-instrumented + functions call instrumented ones. + +config KMSAN_KUNIT_TEST + tristate "KMSAN integration test suite" if !KUNIT_ALL_TESTS + default KUNIT_ALL_TESTS + depends on TRACEPOINTS && KUNIT + help + Test suite for KMSAN, testing various error detection scenarios, + and checking that reports are correctly output to console. + + Say Y here if you want the test to be built into the kernel and run + during boot; say M if you want the test to build as a module; say N + if you are unsure. + +endif -- cgit v1.3.1