From: Jens Axboe axboe@kernel.dk
mainline inclusion from mainline-5.5-rc7 commit 74566df3a71c1b92da608868cca787557d8be7b2 category: feature bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=27 CVE: NA ---------------------------
We don't need it, and if we have it, then the retry handler will attempt to copy the non-existent iovec with the inline iovec, with a segment count that doesn't make sense.
Fixes: f67676d160c6 ("io_uring: ensure async punted read/write requests copy iovec") Reported-by: Jonathan Lemon jonathan.lemon@gmail.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: yangerkun yangerkun@huawei.com Reviewed-by: zhangyi (F) yi.zhang@huawei.com Signed-off-by: Cheng Jian cj.chengjian@huawei.com --- fs/io_uring.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c index 4bb2e5bb843e..83bcc0a0a851 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1785,6 +1785,9 @@ static int io_setup_async_rw(struct io_kiocb *req, ssize_t io_size, struct iovec *iovec, struct iovec *fast_iov, struct iov_iter *iter) { + if (req->opcode == IORING_OP_READ_FIXED || + req->opcode == IORING_OP_WRITE_FIXED) + return 0; if (!req->io && io_alloc_async_ctx(req)) return -ENOMEM;