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authorDylan Yudaken <dylany@fb.com>2022-06-13 03:11:55 -0700
committerJens Axboe <axboe@kernel.dk>2022-06-13 05:13:09 -0600
commit97da4a537924d87e2261773f3ac9365abb191fc9 (patch)
treeacc0f4d6caf1da567fd63808e7901f267a452f8e /fs/io_uring.c
parentb13baccc3850ca8b8cccbf8ed9912dbaa0fdf7f3 (diff)
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io_uring: fix index calculation
When indexing into a provided buffer ring, do not subtract 1 from the index. Fixes: c7fb19428d67 ("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>
Diffstat (limited to 'fs/io_uring.c')
-rw-r--r--fs/io_uring.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 3aab4182fd89..9cf9aff51b70 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -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;
}