Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
io_uring/eventfd: use ctx->rings_rcu for flags checking
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: 79cfe9e59c2a ("io_uring/register: add IORING_REGISTER_RESIZE_RINGS")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
+7
-3
+7
-3
io_uring/eventfd.c
+7
-3
io_uring/eventfd.c
···
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{
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bool skip = false;
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struct io_ev_fd *ev_fd;
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-
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if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED)
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-
return;
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+
struct io_rings *rings;
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guard(rcu)();
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rings = rcu_dereference(ctx->rings_rcu);
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if (!rings)
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return;
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if (READ_ONCE(rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED)
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return;
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ev_fd = rcu_dereference(ctx->io_ev_fd);
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/*
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* Check again if ev_fd exists in case an io_eventfd_unregister call