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, 77 insertions, 0 deletions

diff --git a/tools/net/ynl/Makefile b/tools/net/ynl/Makefile
new file mode 100644
index 000000000..3cefe4ed9
--- /dev/null
+++ b/tools/net/ynl/Makefile
@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: GPL-2.0
+
+include ../../scripts/Makefile.arch
+
+INSTALL	?= install
+prefix  ?= /usr
+ifeq ($(LP64), 1)
+  libdir_relative = lib64
+else
+  libdir_relative = lib
+endif
+libdir  ?= $(prefix)/$(libdir_relative)
+includedir ?= $(prefix)/include
+
+SPECDIR=../../../Documentation/netlink/specs
+
+SUBDIRS = lib generated ynltool tests
+
+all: $(SUBDIRS) libynl.a
+
+tests: | lib generated libynl.a
+ynltool: | lib generated libynl.a
+libynl.a: | lib generated
+	@echo -e "\tAR $@"
+	@$(AR) rcs $@ lib/ynl.o generated/*-user.o
+
+$(SUBDIRS):
+	@if [ -f "$@/Makefile" ] ; then \
+		$(MAKE) -C $@ ; \
+	fi
+
+clean distclean:
+	@for dir in $(SUBDIRS) ; do \
+		if [ -f "$$dir/Makefile" ] ; then \
+			$(MAKE) -C $$dir $@; \
+		fi \
+	done
+	rm -f libynl.a
+	rm -rf pyynl/__pycache__
+	rm -rf pyynl/lib/__pycache__
+	rm -rf pyynl.egg-info
+	rm -rf build
+
+install: libynl.a lib/*.h ynltool
+	@echo -e "\tINSTALL libynl.a"
+	@$(INSTALL) -d $(DESTDIR)$(libdir)
+	@$(INSTALL) -m 0644 libynl.a $(DESTDIR)$(libdir)/libynl.a
+	@echo -e "\tINSTALL libynl headers"
+	@$(INSTALL) -d $(DESTDIR)$(includedir)/ynl
+	@$(INSTALL) -m 0644 lib/*.h $(DESTDIR)$(includedir)/ynl/
+	@echo -e "\tINSTALL pyynl"
+	@pip install --prefix=$(DESTDIR)$(prefix) .
+	@make -C generated install
+	@make -C ynltool install
+
+run_tests:
+	@$(MAKE) -C tests run_tests
+
+lint:
+	yamllint $(SPECDIR)
+
+schema_check:
+	@N=1; \
+	for spec in $(SPECDIR)/*.yaml ; do \
+		NAME=$$(basename $$spec) ; \
+		OUTPUT=$$(./pyynl/cli.py --spec $$spec --validate) ; \
+		if [ $$? -eq 0 ] ; then \
+			echo "ok $$N $$NAME schema validation" ; \
+		else \
+			echo "not ok $$N $$NAME schema validation" ; \
+			echo "$$OUTPUT" ; \
+			echo ; \
+		fi ; \
+		N=$$((N+1)) ; \
+	done
+
+.PHONY: all clean distclean install run_tests lint schema_check $(SUBDIRS)