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, 14 insertions, 0 deletions

diff --git a/lib/crypto/mips/chacha.h b/lib/crypto/mips/chacha.h
new file mode 100644
index 000000000..0c18c0dc2
--- /dev/null
+++ b/lib/crypto/mips/chacha.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ChaCha and HChaCha functions (MIPS optimized)
+ *
+ * Copyright (C) 2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
+ */
+
+#include <linux/kernel.h>
+
+asmlinkage void chacha_crypt_arch(struct chacha_state *state,
+				  u8 *dst, const u8 *src,
+				  unsigned int bytes, int nrounds);
+asmlinkage void hchacha_block_arch(const struct chacha_state *state,
+				   u32 out[HCHACHA_OUT_WORDS], int nrounds);