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io_uring: use GFP_NOWAIT for overflow CQEs on legacy rings

Allocate the overflowing CQE with GFP_NOWAIT instead of GFP_ATOMIC. This
changes causes allocations to fail earlier in out-of-memory situations,
rather than being deferred. Using GFP_ATOMIC allows a process to exceed
memory limits.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220794
Signed-off-by: Alexandre Negrel <alexandre@negrel.dev>
Link: https://lore.kernel.org/io-uring/20251229201933.515797-1-alexandre@negrel.dev/
Signed-off-by: Jens Axboe <axboe@kernel.dk>

authored by

Alexandre Negrel and committed by
Jens Axboe fc5ff250 b14fad55

+1 -1
+1 -1
io_uring/io_uring.c
··· 864 864 { 865 865 struct io_overflow_cqe *ocqe; 866 866 867 - ocqe = io_alloc_ocqe(ctx, cqe, big_cqe, GFP_ATOMIC); 867 + ocqe = io_alloc_ocqe(ctx, cqe, big_cqe, GFP_NOWAIT); 868 868 return io_cqring_add_overflow(ctx, ocqe); 869 869 } 870 870