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io_uring/eventfd: use ctx->rings_rcu for flags checking

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Similarly to what commit e78f7b70e837 did for local task work additions,
use ->rings_rcu under RCU rather than dereference ->rings directly. See
that commit for more details.

Cc: stable@vger.kernel.org
Fixes: 79cfe9e59c ("io_uring/register: add IORING_REGISTER_RESIZE_RINGS")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2026-03-09 14:35:49 -06:00
parent 9618908026
commit 177c694321
1 changed files with 7 additions and 3 deletions
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10
io_uring/eventfd.c
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@@ -76,11 +76,15 @@ void io_eventfd_signal(struct io_ring_ctx *ctx, bool cqe_event)
{
bool skip = false;
struct io_ev_fd *ev_fd;
if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED)
return;
struct io_rings *rings;
guard(rcu)();
rings = rcu_dereference(ctx->rings_rcu);
if (!rings)
return;
if (READ_ONCE(rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED)
return;
ev_fd = rcu_dereference(ctx->io_ev_fd);
/*
* Check again if ev_fd exists in case an io_eventfd_unregister call