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io_uring: fix index calculation 

When indexing into a provided buffer ring, do not subtract 1 from the
index.

Fixes: c7fb19428d ("io_uring: add support for ring mapped supplied buffers")
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220613101157.3687-2-dylany@fb.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dylan Yudaken 2022-06-13 03:11:55 -07:00 committed by Jens Axboe
parent b13baccc38
commit 97da4a5379
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -3888,7 +3888,7 @@ static void __user *io_ring_buffer_select(struct io_kiocb *req, size_t *len,
buf = &br->bufs[head];
} else {
int off = head & (IO_BUFFER_LIST_BUF_PER_PAGE - 1);
int index = head / IO_BUFFER_LIST_BUF_PER_PAGE - 1;
int index = head / IO_BUFFER_LIST_BUF_PER_PAGE;
buf = page_address(bl->buf_pages[index]);
buf += off;
}