In the Linux kernel, the following vulnerability has been resolved:

RDMA/bng_re: return a timeout when firmware responses stall

__wait_for_resp() documents that it returns a non-zero error when a
firmware command does not complete, and bng_re_rcfw_send_message() already
marks the firmware as stalled when the helper returns -ENODEV.

However, the helper ignores wait_event_timeout() expiry.  If the response
slot remains in use after the timeout and after the polled CREQ service
attempt, the loop starts another full timeout period and can repeat
forever.

Return -ENODEV after a timed out wait that still has no response.  The
existing caller then marks FIRMWARE_STALL_DETECTED and returns
-ETIMEDOUT to the command issuer.