HID: mcp2200: validate READ_ALL response length

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 47669bec44fe ("HID: asus: refactor the two workqueues and init
sequence") added the same kind of raw_event length validation to hid-asus.

Fixes: 740329d7120f ("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>

0 files changed, 0 insertions, 0 deletions