commit
0a535eddbe0dc1de4386046ab849f08aeb2f8faf upstream.
If IOSQE_ASYNC is set and we fail importing an iovec for a readv or
writev request, then we leave ->bytes_done uninitialized and hence the
eventual failure CQE posted can potentially have a random res value
rather than the expected -EINVAL.
Setup ->bytes_done before potentially failing, so we have a consistent
value if we fail the request early.
Cc: stable@vger.kernel.org
Reported-by: xingwei lee <xrivendell7@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
struct iovec *iov;
int ret;
+ iorw->bytes_done = 0;
+ iorw->free_iovec = NULL;
+
/* submission path, ->uring_lock should already be taken */
ret = io_import_iovec(rw, req, &iov, &iorw->s, 0);
if (unlikely(ret < 0))
return ret;
- iorw->bytes_done = 0;
- iorw->free_iovec = iov;
- if (iov)
+ if (iov) {
+ iorw->free_iovec = iov;
req->flags |= REQ_F_NEED_CLEANUP;
+ }
+
return 0;
}