linux-kernel - [PATCH 4.17 297/336] blkdev: __blkdev_direct_IO

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Message-Id: <20180801165040.406919814@linuxfoundation.org>
Date:   Wed,  1 Aug 2018 18:50:32 +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, Ming Lei <ming.lei@...hat.com>,
        Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>, Martin Wilck <mwilck@...e.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 4.17 297/336] blkdev: __blkdev_direct_IO_simple: fix leak in error case

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Martin Wilck <mwilck@...e.com>

commit 9362dd1109f87a9d0a798fbc890cb339c171ed35 upstream.

Fixes: 72ecad22d9f1 ("block: support a full bio worth of IO for simplified bdev direct-io")
Reviewed-by: Ming Lei <ming.lei@...hat.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Martin Wilck <mwilck@...e.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/block_dev.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -219,7 +219,7 @@ __blkdev_direct_IO_simple(struct kiocb *
 
 	ret = bio_iov_iter_get_pages(&bio, iter);
 	if (unlikely(ret))
-		return ret;
+		goto out;
 	ret = bio.bi_iter.bi_size;
 
 	if (iov_iter_rw(iter) == READ) {
@@ -248,12 +248,13 @@ __blkdev_direct_IO_simple(struct kiocb *
 		put_page(bvec->bv_page);
 	}
 
-	if (vecs != inline_vecs)
-		kfree(vecs);
-
 	if (unlikely(bio.bi_status))
 		ret = blk_status_to_errno(bio.bi_status);
 
+out:
+	if (vecs != inline_vecs)
+		kfree(vecs);
+
 	bio_uninit(&bio);
 
 	return ret;