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io_uring: fix unexpected placement on same size resizing 

There might be many reasons why a user is resizing a ring, e.g. moving
to huge pages or for some memory compaction using IORING_SETUP_NO_MMAP.
Don't bypass resizing, the user will definitely be surprised seeing 0
while the rings weren't actually moved to a new place.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
pull/1354/merge
Pavel Begunkov 2025-10-15 13:10:31 +01:00 committed by Jens Axboe
parent be7cab44ed
commit 437c23357d
1 changed files with 0 additions and 7 deletions
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7
io_uring/register.c
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@ -421,13 +421,6 @@ static int io_register_resize_rings(struct io_ring_ctx *ctx, void __user *arg)
if (unlikely(ret))
return ret;
/* nothing to do, but copy params back */
if (p.sq_entries == ctx->sq_entries && p.cq_entries == ctx->cq_entries) {
if (copy_to_user(arg, &p, sizeof(p)))
return -EFAULT;
return 0;
}
size = rings_size(p.flags, p.sq_entries, p.cq_entries,
&sq_array_offset);
if (size == SIZE_MAX)