io_uring/timeout: no ABS update of multishot timeouts

IORING_TIMEOUT_MULTISHOT can't be combined with IORING_TIMEOUT_ABS, prep
rejects that, as the request is armed again with the same value each time
it fires. IORING_TIMEOUT_UPDATE doesn't check and takes an absolute time
for a multishot timeout. The first expiry is as asked for, but
io_timeout_complete() then arms the timer with ->mode of the original
request, i.e. it uses the absolute time as the interval. With
CLOCK_MONOTONIC the next expiry is an uptime away, with CLOCK_REALTIME
more than fifty years.

Fail such an update with -EINVAL, and do so before the timeout is
touched.

Fixes: ea97f6c8558e ("io_uring: add support for multishot timeouts")
Assisted-by: LLM
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Link: https://patch.msgid.link/20261015-b4-io-uring-fixes-v1-41-c1556f5d7bf5@toxicpanda.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions