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, 92 insertions, 0 deletions

diff --git a/tools/counter/counter_example.c b/tools/counter/counter_example.c
new file mode 100644
index 000000000..be55287b9
--- /dev/null
+++ b/tools/counter/counter_example.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Counter - example userspace application
+ *
+ * The userspace application opens /dev/counter0, configures the
+ * COUNTER_EVENT_INDEX event channel 0 to gather Count 0 count and Count
+ * 1 count, and prints out the data as it becomes available on the
+ * character device node.
+ *
+ * Copyright (C) 2021 William Breathitt Gray
+ */
+#include <errno.h>
+#include <fcntl.h>
+#include <linux/counter.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+static struct counter_watch watches[2] = {
+	{
+		/* Component data: Count 0 count */
+		.component.type = COUNTER_COMPONENT_COUNT,
+		.component.scope = COUNTER_SCOPE_COUNT,
+		.component.parent = 0,
+		/* Event type: Index */
+		.event = COUNTER_EVENT_INDEX,
+		/* Device event channel 0 */
+		.channel = 0,
+	},
+	{
+		/* Component data: Count 1 count */
+		.component.type = COUNTER_COMPONENT_COUNT,
+		.component.scope = COUNTER_SCOPE_COUNT,
+		.component.parent = 1,
+		/* Event type: Index */
+		.event = COUNTER_EVENT_INDEX,
+		/* Device event channel 0 */
+		.channel = 0,
+	},
+};
+
+int main(void)
+{
+	int fd;
+	int ret;
+	int i;
+	struct counter_event event_data[2];
+
+	fd = open("/dev/counter0", O_RDWR);
+	if (fd == -1) {
+		perror("Unable to open /dev/counter0");
+		return 1;
+	}
+
+	for (i = 0; i < 2; i++) {
+		ret = ioctl(fd, COUNTER_ADD_WATCH_IOCTL, watches + i);
+		if (ret == -1) {
+			fprintf(stderr, "Error adding watches[%d]: %s\n", i,
+				strerror(errno));
+			return 1;
+		}
+	}
+	ret = ioctl(fd, COUNTER_ENABLE_EVENTS_IOCTL);
+	if (ret == -1) {
+		perror("Error enabling events");
+		return 1;
+	}
+
+	for (;;) {
+		ret = read(fd, event_data, sizeof(event_data));
+		if (ret == -1) {
+			perror("Failed to read event data");
+			return 1;
+		}
+
+		if (ret != sizeof(event_data)) {
+			fprintf(stderr, "Failed to read event data\n");
+			return -EIO;
+		}
+
+		printf("Timestamp 0: %llu\tCount 0: %llu\n"
+		       "Error Message 0: %s\n"
+		       "Timestamp 1: %llu\tCount 1: %llu\n"
+		       "Error Message 1: %s\n",
+		       event_data[0].timestamp, event_data[0].value,
+		       strerror(event_data[0].status),
+		       event_data[1].timestamp, event_data[1].value,
+		       strerror(event_data[1].status));
+	}
+
+	return 0;
+}