io_uring/fdinfo: fix CQE dump of CQE32 rings

Since the CQ ring dump was changed to deal with IORING_SETUP_CQE_MIXED, a
32b CQE is taken to occupy two entries of the ring. That is how it works
for mixed rings. With IORING_SETUP_CQE32 each entry has twice the size:
head and tail count 32b CQEs, and entry n is found at cqes[n << 1].

For such rings the dump reads cqes[n], and skips every other entry. It
shows half of the pending CQEs at best, and what it shows is taken from
the wrong place unless the head happens to be at the start of the ring.
The extra data of the last entry isn't shown at all, as the check that
keeps the dump of a mixed ring from reading beyond the array is applied to
these rings as well.

Fixes: 82ceb7fcc5ff ("io_uring/fdinfo: handle mixed sized CQEs")
Assisted-by: LLM
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Link: https://patch.msgid.link/20261015-b4-io-uring-fixes-v1-28-c1556f5d7bf5@toxicpanda.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions