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io_uring: correct size of overflow CQE calculation 

If a 32b CQE is required, don't double the size of the overflow struct,
just add the size of the io_uring_cqe addition that is needed. This
avoids allocating too much memory, as the io_overflow_cqe size includes
the list member required to queue them too.

Fixes: e26dca67fd ("io_uring: add support for IORING_SETUP_CQE_MIXED")
Reviewed-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
pull/1354/merge
Jens Axboe 2025-09-10 09:50:30 -06:00
parent 9f5f69d98e
commit 9adc6669a6
1 changed files with 1 additions and 1 deletions
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io_uring/io_uring.c
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@ -756,7 +756,7 @@ static struct io_overflow_cqe *io_alloc_ocqe(struct io_ring_ctx *ctx,
if (cqe->flags & IORING_CQE_F_32 || ctx->flags & IORING_SETUP_CQE32) { if (cqe->flags & IORING_CQE_F_32 || ctx->flags & IORING_SETUP_CQE32) {
is_cqe32 = true; is_cqe32 = true;
ocq_size <<= 1; ocq_size += sizeof(struct io_uring_cqe);
} }
ocqe = kzalloc(ocq_size, gfp | __GFP_ACCOUNT); ocqe = kzalloc(ocq_size, gfp | __GFP_ACCOUNT);