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, 45 insertions, 0 deletions

diff --git a/lib/crypto/arm/sha1.h b/lib/crypto/arm/sha1.h
new file mode 100644
index 000000000..3e2d8c7ca
--- /dev/null
+++ b/lib/crypto/arm/sha1.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SHA-1 optimized for ARM
+ *
+ * Copyright 2025 Google LLC
+ */
+#include <asm/simd.h>
+
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
+static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
+
+asmlinkage void sha1_block_data_order(struct sha1_block_state *state,
+				      const u8 *data, size_t nblocks);
+asmlinkage void sha1_transform_neon(struct sha1_block_state *state,
+				    const u8 *data, size_t nblocks);
+asmlinkage void sha1_ce_transform(struct sha1_block_state *state,
+				  const u8 *data, size_t nblocks);
+
+static void sha1_blocks(struct sha1_block_state *state,
+			const u8 *data, size_t nblocks)
+{
+	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
+	    static_branch_likely(&have_neon) && likely(may_use_simd())) {
+		scoped_ksimd() {
+			if (static_branch_likely(&have_ce))
+				sha1_ce_transform(state, data, nblocks);
+			else
+				sha1_transform_neon(state, data, nblocks);
+		}
+	} else {
+		sha1_block_data_order(state, data, nblocks);
+	}
+}
+
+#ifdef CONFIG_KERNEL_MODE_NEON
+#define sha1_mod_init_arch sha1_mod_init_arch
+static void sha1_mod_init_arch(void)
+{
+	if (elf_hwcap & HWCAP_NEON) {
+		static_branch_enable(&have_neon);
+		if (elf_hwcap2 & HWCAP2_SHA1)
+			static_branch_enable(&have_ce);
+	}
+}
+#endif /* CONFIG_KERNEL_MODE_NEON */