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io_uring/rsrc: ignore dummy_ubuf for buffer cloning

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For placeholder buffers, &dummy_ubuf is assigned which is a static
value. When buffers are attempted cloned, don't attempt to grab a
reference to it, as we both don't need it and it'll actively fail as
dummy_ubuf doesn't have a valid reference count setup.

Link: https://lore.kernel.org/io-uring/Zw8dkUzsxQ5LgAJL@ly-workstation/
Reported-by: Lai, Yi <yi1.lai@linux.intel.com>
Fixes: 7cc2a6eadc ("io_uring: add IORING_REGISTER_COPY_BUFFERS method")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-10-16 07:09:25 -06:00
parent 28aabffae6
commit 858e686a30
1 changed files with 2 additions and 1 deletions
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io_uring/rsrc.c
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@ -1176,6 +1176,7 @@ static int io_clone_buffers(struct io_ring_ctx *ctx, struct io_ring_ctx *src_ctx
for (i = 0; i < nbufs; i++) {
struct io_mapped_ubuf *src = src_ctx->user_bufs[i];
if (src != &dummy_ubuf)
refcount_inc(&src->refs);
user_bufs[i] = src;
}