linux-kernel - [PATCH] ubi: do not drop UBI device reference before using

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Date:   Wed, 28 Nov 2018 11:20:03 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Artem Bityutskiy <dedekind1@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: [PATCH] ubi: do not drop UBI device reference before using

The UBI device reference is dropped but then the device is used as a
parameter of ubi_err. The bug is introduced in changing ubi_err's 
behavior. The old ubi_err does not require a UBI device as its first 
parameter, but the new one does.

Fixes: 32608703310 ("UBI: Extend UBI layer debug/messaging capabilities")

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/mtd/ubi/kapi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index e9e9ecb..0b8f0c4 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -227,9 +227,9 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
 out_free:
 	kfree(desc);
 out_put_ubi:
-	ubi_put_device(ubi);
 	ubi_err(ubi, "cannot open device %d, volume %d, error %d",
 		ubi_num, vol_id, err);
+	ubi_put_device(ubi);
 	return ERR_PTR(err);
 }
 EXPORT_SYMBOL_GPL(ubi_open_volume);
-- 
2.7.4