HID: rate-limit hid_warn to prevent log flooding

Syzkaller can create many uhid devices that trigger
repeated warnings like:

  "hid-generic xxxx: unknown main item tag 0x0"

These messages can flood the system log, especially if a crash occurs
(e.g., with a slow UART console, leading to soft lockups). To mitigate
this, convert `hid_warn()` to use `dev_warn_ratelimited()`.

This helps reduce log noise and improves system stability under fuzzing
or faulty device scenarios.

Signed-off-by: Li Chen <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

Author: FirstLoveLife

drivers/hid/hid-core.c

@@ -659,9 +659,9 @@ static int hid_parser_main(struct hid_parser *parser, struct hid_item *item)
 	default:
 		if (item->tag >= HID_MAIN_ITEM_TAG_RESERVED_MIN &&
 			item->tag <= HID_MAIN_ITEM_TAG_RESERVED_MAX)
-			hid_warn(parser->device, "reserved main item tag 0x%x\n", item->tag);
+			hid_warn_ratelimited(parser->device, "reserved main item tag 0x%x\n", item->tag);
 		else
-			hid_warn(parser->device, "unknown main item tag 0x%x\n", item->tag);
+			hid_warn_ratelimited(parser->device, "unknown main item tag 0x%x\n", item->tag);
 		ret = 0;
 	}
 

include/linux/hid.h

@@ -1239,6 +1239,8 @@ void hid_quirks_exit(__u16 bus);
 	dev_notice(&(hid)->dev, fmt, ##__VA_ARGS__)
 #define hid_warn(hid, fmt, ...)				\
 	dev_warn(&(hid)->dev, fmt, ##__VA_ARGS__)
+#define hid_warn_ratelimited(hid, fmt, ...)				\
+	dev_warn_ratelimited(&(hid)->dev, fmt, ##__VA_ARGS__)
 #define hid_info(hid, fmt, ...)				\
 	dev_info(&(hid)->dev, fmt, ##__VA_ARGS__)
 #define hid_dbg(hid, fmt, ...)				\