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HID: mcp2200: validate READ_ALL response length

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The HID core invokes raw_event callbacks before validating the report
length.  mcp2200_raw_event() casts a READ_ALL response to struct
mcp_read_all_resp and reads fields through offset ten without checking that
the response contains the structure.

A one-byte READ_ALL response reproduced the issue under KASAN:

  BUG: KASAN: slab-out-of-bounds in mcp2200_raw_event+0x24b/0x3a0
  Read of size 1 by task hidtrigger/89
  Call Trace:
   mcp2200_raw_event+0x24b/0x3a0
   kasan_report+0x139/0x170

Reject an incomplete READ_ALL response with a protocol error before reading
its fields.  The common completion path then wakes the command waiter with
the error instead of leaving it to time out.

Commit 47669bec44 ("HID: asus: refactor the two workqueues and init
sequence") added the same kind of raw_event length validation to hid-asus.

Fixes: 740329d712 ("HID: mcp2200: added driver for GPIOs of MCP2200")
Cc: stable@vger.kernel.org
Signed-off-by: Jiale Yao <yaojiale02@163.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Jiale Yao 2026-09-24 22:44:09 +08:00 committed by Jiri Kosina
parent c2deafcb4c
commit 26ce0e6bf0
1 changed files with 5 additions and 0 deletions
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5
drivers/hid/hid-mcp2200.c
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@ -301,6 +301,11 @@ static int mcp2200_raw_event(struct hid_device *hdev, struct hid_report *report,
switch (data[0]) {
case READ_ALL:
if (size < sizeof(*all_resp)) {
mcp->status = -EPROTO;
break;
}
all_resp = (struct mcp_read_all_resp *) data;
mcp->status = 0;
mcp->gpio_inval = all_resp->io_port_val_bmap;