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From: Dylan Yudaken <[email protected]>
To: <[email protected]>, <[email protected]>, <[email protected]>
Cc: <[email protected]>, Dylan Yudaken <[email protected]>
Subject: [PATCH 1/3] io_uring: fix index calculation
Date: Mon, 13 Jun 2022 03:11:55 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

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 <[email protected]>
---
 fs/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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;
 	}
-- 
2.30.2


  reply	other threads:[~2022-06-13 10:12 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-13 10:11 [PATCH 0/3] io_uring: fixes for provided buffer ring Dylan Yudaken
2022-06-13 10:11 ` Dylan Yudaken [this message]
2022-06-13 10:11 ` [PATCH 2/3] io_uring: fix types in " Dylan Yudaken
2022-06-13 10:11 ` [PATCH 3/3] io_uring: limit size of " Dylan Yudaken
2022-06-13 11:08 ` [PATCH 0/3] io_uring: fixes for " Hao Xu
2022-06-13 12:59   ` Pavel Begunkov
2022-06-13 13:16     ` Dylan Yudaken
2022-06-13 14:05       ` Pavel Begunkov
2022-06-14  3:47         ` Hao Xu
2022-06-13 12:49 ` Jens Axboe

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