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HID: rate-limit hid_warn to prevent log flooding

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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 <chenl311@chinatelecom.cn>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Li Chen 2025-06-20 20:02:31 +08:00 committed by Jiri Kosina
parent 37a9acb971
commit 4051ead998
2 changed files with 4 additions and 2 deletions
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4
drivers/hid/hid-core.c
View File

@ -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;
}

2
include/linux/hid.h
View File

@ -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, ...) \