linux-kernel - [PATCH 5.4 73/86] lightnvm: fix memory leak when submit fails

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Date:   Mon, 25 Jan 2021 19:39:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pan Bian <bianpan2016@....com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.4 73/86] lightnvm: fix memory leak when submit fails

From: Pan Bian <bianpan2016@....com>

commit 97784481757fba7570121a70dd37ca74a29f50a8 upstream.

The allocated page is not released if error occurs in
nvm_submit_io_sync_raw(). __free_page() is moved ealier to avoid
possible memory leak issue.

Fixes: aff3fb18f957 ("lightnvm: move bad block and chunk state logic to core")
Signed-off-by: Pan Bian <bianpan2016@....com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/lightnvm/core.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -849,11 +849,10 @@ static int nvm_bb_chunk_sense(struct nvm
 	rqd.ppa_addr = generic_to_dev_addr(dev, ppa);
 
 	ret = nvm_submit_io_sync_raw(dev, &rqd);
+	__free_page(page);
 	if (ret)
 		return ret;
 
-	__free_page(page);
-
 	return rqd.error;
 }