linux-kernel - [PATCH 5.8 96/99] io_uring: ensure open/openat2 name is cleaned on cancelation

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Message-Id: <20200929105934.476208525@linuxfoundation.org>
Date:   Tue, 29 Sep 2020 13:02:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stefano Garzarella <sgarzare@...hat.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.8 96/99] io_uring: ensure open/openat2 name is cleaned on cancelation

From: Jens Axboe <axboe@...nel.dk>

commit f3cd4850504ff612d0ea77a0aaf29b66c98fcefe upstream.

If we cancel these requests, we'll leak the memory associated with the
filename. Add them to the table of ops that need cleaning, if
REQ_F_NEED_CLEANUP is set.

Cc: stable@...r.kernel.org
Fixes: e62753e4e292 ("io_uring: call statx directly")
Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/io_uring.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5254,6 +5254,8 @@ static void io_cleanup_req(struct io_kio
 		break;
 	case IORING_OP_OPENAT:
 	case IORING_OP_OPENAT2:
+		if (req->open.filename)
+			putname(req->open.filename);
 		break;
 	case IORING_OP_SPLICE:
 	case IORING_OP_TEE: