drm/mediatek: Add missing IS_ERR check for ovl_adaptor platform devicegrafted

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 <lihaojie@kylinos.cn>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260825100845.438893-1-lihaojie@kylinos.cn/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

1 files changed, 178 insertions, 0 deletions

diff --git a/tools/tracing/rtla/Makefile b/tools/tracing/rtla/Makefile
new file mode 100644
index 000000000..387bc6cc1
--- /dev/null
+++ b/tools/tracing/rtla/Makefile
@@ -0,0 +1,178 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+ifeq ($(srctree),)
+  srctree	:= $(patsubst %/,%,$(dir $(CURDIR)))
+  srctree	:= $(patsubst %/,%,$(dir $(srctree)))
+  srctree	:= $(patsubst %/,%,$(dir $(srctree)))
+endif
+
+include $(srctree)/tools/scripts/Makefile.include
+
+# O is an alias for OUTPUT
+OUTPUT          := $(O)
+
+ifeq ($(OUTPUT),)
+  OUTPUT        := $(CURDIR)
+else
+  # subdir is used by the ../Makefile in $(call descend,)
+  ifneq ($(subdir),)
+    OUTPUT        := $(OUTPUT)/$(subdir)
+  endif
+endif
+
+ifneq ($(patsubst %/,,$(lastword $(OUTPUT))),)
+  OUTPUT        := $(OUTPUT)/
+endif
+
+RTLA		:= $(OUTPUT)rtla
+RTLA_IN		:= $(RTLA)-in.o
+
+LIBSUBCMD_DIR = $(srctree)/tools/lib/subcmd/
+ifneq ($(OUTPUT),)
+  LIBSUBCMD_OUTPUT = $(abspath $(OUTPUT))/libsubcmd
+else
+  LIBSUBCMD_OUTPUT = $(CURDIR)/libsubcmd
+endif
+LIBSUBCMD = $(LIBSUBCMD_OUTPUT)/libsubcmd.a
+LIBSUBCMD_INCLUDES = $(LIBSUBCMD_OUTPUT)/include
+LIBSUBCMD_MAKEFLAGS = O=$(LIBSUBCMD_OUTPUT) DESTDIR=$(LIBSUBCMD_OUTPUT) prefix= subdir=
+
+TOOLS_INCLUDES = -I$(srctree)/tools/include
+
+ifneq ($(OUTPUT),)
+  LIB_OUTPUT = $(abspath $(OUTPUT))/lib
+else
+  LIB_OUTPUT = $(CURDIR)/lib
+endif
+
+LIB_CTYPE = $(LIB_OUTPUT)/ctype.o
+LIB_CTYPE_SRC = $(srctree)/tools/lib/ctype.c
+
+LIB_STRING = $(LIB_OUTPUT)/string.o
+LIB_STRING_SRC = $(srctree)/tools/lib/string.c
+
+LIB_STR_ERROR_R = $(LIB_OUTPUT)/str_error_r.o
+LIB_STR_ERROR_R_SRC = $(srctree)/tools/lib/str_error_r.c
+
+VERSION		:= $(shell sh -c "make -sC ../../.. kernelversion | grep -v make")
+DOCSRC		:= ../../../Documentation/tools/rtla/
+
+FEATURE_TESTS	:= libtraceevent
+FEATURE_TESTS	+= libtracefs
+FEATURE_TESTS	+= libcpupower
+FEATURE_TESTS	+= libcheck
+FEATURE_TESTS	+= libbpf
+FEATURE_TESTS	+= clang-bpf-co-re
+FEATURE_TESTS	+= bpftool-skeletons
+FEATURE_DISPLAY	:= libtraceevent
+FEATURE_DISPLAY	+= libtracefs
+FEATURE_DISPLAY	+= libcpupower
+FEATURE_DISPLAY	+= libcheck
+FEATURE_DISPLAY	+= libbpf
+FEATURE_DISPLAY	+= clang-bpf-co-re
+FEATURE_DISPLAY	+= bpftool-skeletons
+
+all: $(RTLA)
+
+include $(srctree)/tools/build/Makefile.include
+include Makefile.rtla
+include tests/unit/Makefile.unit
+
+# check for dependencies only on required targets
+NON_CONFIG_TARGETS := clean install tarball doc doc_clean doc_install
+
+config		:= 1
+ifdef MAKECMDGOALS
+ifeq ($(filter-out $(NON_CONFIG_TARGETS),$(MAKECMDGOALS)),)
+ config		:= 0
+endif
+endif
+
+ifeq ($(config),1)
+  include $(srctree)/tools/build/Makefile.feature
+  include Makefile.config
+endif
+
+CFLAGS		+= $(INCLUDES) $(LIB_INCLUDES) $(TOOLS_INCLUDES) -I$(LIBSUBCMD_INCLUDES)
+
+export CFLAGS OUTPUT srctree
+
+ifeq ($(BUILD_BPF_SKEL),1)
+src/timerlat.bpf.o: src/timerlat.bpf.c
+	$(QUIET_CLANG)$(CLANG) -g -O2 -target bpf -c $(filter %.c,$^) -o $@
+
+src/timerlat.skel.h: src/timerlat.bpf.o
+	$(QUIET_GENSKEL)$(SYSTEM_BPFTOOL) gen skeleton $< > $@
+
+example/timerlat_bpf_action.o: example/timerlat_bpf_action.c
+	$(QUIET_CLANG)$(CLANG) -g -O2 -target bpf -c $(filter %.c,$^) -o $@
+
+tests/bpf/bpf_action_map.o: tests/bpf/bpf_action_map.c
+	$(QUIET_CLANG)$(CLANG) -g -O2 -target bpf -c $(filter %.c,$^) -o $@
+else
+src/timerlat.skel.h:
+	$(Q)echo '/* BPF skeleton is disabled */' > src/timerlat.skel.h
+
+example/timerlat_bpf_action.o: example/timerlat_bpf_action.c
+	$(Q)echo "BPF skeleton support is disabled, skipping example/timerlat_bpf_action.o"
+
+tests/bpf/bpf_action_map.o: tests/bpf/bpf_action_map.c
+	$(Q)echo "BPF skeleton support is disabled, skipping tests/bpf/bpf_action_map.o"
+endif
+
+$(RTLA): $(RTLA_IN) $(LIBSUBCMD) $(LIB_CTYPE) $(LIB_STRING) $(LIB_STR_ERROR_R)
+	$(QUIET_LINK)$(CC) $(LDFLAGS) -o $(RTLA) $(RTLA_IN) $(LIBSUBCMD) $(LIB_CTYPE) $(LIB_STRING) $(LIB_STR_ERROR_R) $(EXTLIBS)
+
+static: $(RTLA_IN) $(LIBSUBCMD) $(LIB_CTYPE) $(LIB_STRING) $(LIB_STR_ERROR_R)
+	$(eval LDFLAGS += -static)
+	$(QUIET_LINK)$(CC) -static $(LDFLAGS) -o $(RTLA)-static $(RTLA_IN) $(LIBSUBCMD) $(LIB_CTYPE) $(LIB_STRING) $(LIB_STR_ERROR_R) $(EXTLIBS)
+
+rtla.%: fixdep FORCE
+	make -f $(srctree)/tools/build/Makefile.build dir=. $@
+
+$(RTLA_IN): fixdep FORCE src/timerlat.skel.h $(LIBSUBCMD_INCLUDES)
+	make $(build)=rtla
+
+$(LIBSUBCMD_OUTPUT):
+	$(Q)$(MKDIR) -p $@
+
+$(LIBSUBCMD_INCLUDES): FORCE | $(LIBSUBCMD_OUTPUT)
+	$(Q)$(MAKE) -C $(LIBSUBCMD_DIR) $(LIBSUBCMD_MAKEFLAGS) \
+		install_headers
+
+$(LIBSUBCMD): FORCE | $(LIBSUBCMD_OUTPUT)
+	$(Q)$(MAKE) -C $(LIBSUBCMD_DIR) $(LIBSUBCMD_MAKEFLAGS) \
+		$@
+
+$(LIB_OUTPUT):
+	$(Q)$(MKDIR) -p $@
+
+$(LIB_STR_ERROR_R): $(LIB_STR_ERROR_R_SRC) | $(LIB_OUTPUT)
+	$(QUIET_CC)$(CC) $(CFLAGS) -c -o $@ $<
+
+$(LIB_STRING): $(LIB_STRING_SRC) | $(LIB_OUTPUT)
+	$(QUIET_CC)$(CC) $(CFLAGS) -c -o $@ $<
+
+$(LIB_CTYPE): $(LIB_CTYPE_SRC) | $(LIB_OUTPUT)
+	$(QUIET_CC)$(CC) $(CFLAGS) -c -o $@ $<
+
+libsubcmd-clean:
+	$(call QUIET_CLEAN, libsubcmd)
+	$(Q)$(RM) -r -- $(LIBSUBCMD_OUTPUT)
+
+lib-clean:
+	$(call QUIET_CLEAN, lib)
+	$(Q)$(RM) -r -- $(LIB_OUTPUT)
+
+clean: doc_clean fixdep-clean libsubcmd-clean lib-clean
+	$(call QUIET_CLEAN, rtla)
+	$(Q)find . -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
+	$(Q)rm -f rtla rtla-static fixdep FEATURE-DUMP rtla-*
+	$(Q)rm -rf feature
+	$(Q)rm -f src/timerlat.bpf.o src/timerlat.skel.h example/timerlat_bpf_action.o
+	$(Q)rm -f $(UNIT_TESTS)
+
+check: $(RTLA) tests/bpf/bpf_action_map.o
+	RTLA=$(RTLA) BPFTOOL=$(SYSTEM_BPFTOOL) prove -o -f -v tests/
+examples: example/timerlat_bpf_action.o
+.PHONY: FORCE clean check