From 3f9d64415fdaa73017fcb168930006648617b488 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 11 Mar 2020 12:27:04 -0600 Subject: [PATCH] io_uring: fix truncated async read/readv and write/writev retry Ensure we keep the truncated value, if we did truncate it. If not, we might read/write more than the registered buffer size. Also for retry, ensure that we return the truncated mapped value for the vectorized versions of the read/write commands. Signed-off-by: Jens Axboe --- fs/io_uring.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 9f1a462e..55afae6 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2360,6 +2360,7 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req, *iovec = NULL; return PTR_ERR(buf); } + req->rw.len = sqe_len; } ret = import_single_range(rw, buf, sqe_len, *iovec, iter); @@ -2379,8 +2380,10 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req, if (req->flags & REQ_F_BUFFER_SELECT) { ret = io_iov_buffer_select(req, *iovec, needs_lock); - if (!ret) - iov_iter_init(iter, rw, *iovec, 1, (*iovec)->iov_len); + if (!ret) { + ret = (*iovec)->iov_len; + iov_iter_init(iter, rw, *iovec, 1, ret); + } *iovec = NULL; return ret; } -- 2.7.4