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io_uring/kbuf: return correct iovec count from classic buffer peek

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io_provided_buffers_select() returns 0 to indicate success, but it should
be returning 1 to indicate that 1 vec was mapped. This causes peeking
to fail with classic provided buffers, and while that's not a use case
that anyone should use, it should still work correctly.

The end result is that no buffer will be selected, and hence a completion
with '0' as the result will be posted, without a buffer attached.

Fixes: 35c8711c8f ("io_uring/kbuf: add helpers for getting/peeking multiple buffers")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-08-30 10:45:54 -06:00
parent 1c47c0d601
commit f274495aea
1 changed files with 1 additions and 1 deletions
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io_uring/kbuf.c
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@ -129,7 +129,7 @@ static int io_provided_buffers_select(struct io_kiocb *req, size_t *len,
iov[0].iov_base = buf; iov[0].iov_base = buf;
iov[0].iov_len = *len; iov[0].iov_len = *len;
return 0; return 1;
} }
static struct io_uring_buf *io_ring_head_to_buf(struct io_uring_buf_ring *br, static struct io_uring_buf *io_ring_head_to_buf(struct io_uring_buf_ring *br,