[PATCH 3/4][SRU][BIONIC] blkdev: __blkdev_direct_IO_simple: fix leak in error case

[Colin King]

From: Martin Wilck <mwilck at suse.com>

Buglink: https://bugs.launchpad.net/bugs/1796542

Fixes: 72ecad22d9f1 ("block: support a full bio worth of IO for simplified bdev direct-io")
Reviewed-by: Ming Lei <ming.lei at redhat.com>
Reviewed-by: Hannes Reinecke <hare at suse.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Signed-off-by: Martin Wilck <mwilck at suse.com>
Signed-off-by: Jens Axboe <axboe at kernel.dk>
(cherry picked from commit 9362dd1109f87a9d0a798fbc890cb339c171ed35)
Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 fs/block_dev.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 82c823ef06a6..74b4ae9b7ba0 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -219,7 +219,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter,
 
 	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 *iocb, struct iov_iter *iter,
 		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;
-- 
2.17.1