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/thermal/lib/log.c b/tools/thermal/lib/log.c
new file mode 100644
index 000000000..597d6e7f7
--- /dev/null
+++ b/tools/thermal/lib/log.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+#include "log.h"
+
+static const char *__ident = "unknown";
+static int __options;
+
+static const char * const loglvl[] = {
+	[LOG_DEBUG]	= "DEBUG",
+	[LOG_INFO]	= "INFO",
+	[LOG_NOTICE]	= "NOTICE",
+	[LOG_WARNING]	= "WARN",
+	[LOG_ERR]	= "ERROR",
+	[LOG_CRIT]	= "CRITICAL",
+	[LOG_ALERT]	= "ALERT",
+	[LOG_EMERG]	= "EMERG",
+};
+
+int log_str2level(const char *lvl)
+{
+	int i;
+
+	for (i = 0; i < sizeof(loglvl) / sizeof(loglvl[LOG_DEBUG]); i++)
+		if (!strcmp(lvl, loglvl[i]))
+			return i;
+
+	return LOG_DEBUG;
+}
+
+extern void logit(int level, const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+
+	if (__options & TO_SYSLOG)
+		vsyslog(level, format, args);
+
+	if (__options & TO_STDERR)
+		vfprintf(stderr, format, args);
+
+	if (__options & TO_STDOUT)
+		vfprintf(stdout, format, args);
+
+	va_end(args);
+}
+
+int log_init(int level, const char *ident, int options)
+{
+	if (!options)
+		return -1;
+
+	if (level > LOG_DEBUG)
+		return -1;
+
+	if (!ident)
+		return -1;
+
+	__ident = ident;
+	__options = options;
+
+	if (options & TO_SYSLOG) {
+		openlog(__ident, options | LOG_NDELAY, LOG_USER);
+		setlogmask(LOG_UPTO(level));
+	}
+
+	return 0;
+}
+
+void log_exit(void)
+{
+	closelog();
+}