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652117c3ed
nrf91_usrsock_ioctl_handler() copies req->arglen bytes from the
request payload into the fixed-size usrsock->out buffer without
validating that the payload actually fits either the received
request or the destination buffer. A crafted ioctl request with
an inflated arglen triggers:
1. OOB read — memcpy reads past the end of the received request.
2. OOB write — memcpy writes past the end of usrsock->out.
Add three checks before the copy:
- len >= sizeof(*req): ensure the full request header is present.
- copylen <= len - sizeof(*req): payload must fit the received data.
- copylen <= sizeof(usrsock->out) - sizeof(*ack): payload must fit
the destination buffer.
The recvfrom handler in the same file already performs the equivalent
buffer-size check (line 892). Fixes #18515.
Signed-off-by: hanzj <hanzjian@zepp.com>
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