linux-kernel - [PATCH AUTOSEL 4.9 17/91] ubi: Do not drop UBI device reference before using

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Message-Id: <20191122060129.4239-16-sashal@kernel.org>
Date:   Fri, 22 Nov 2019 01:00:15 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Pan Bian <bianpan2016@....com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Sasha Levin <sashal@...nel.org>, linux-mtd@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.9 17/91] ubi: Do not drop UBI device reference before using

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

[ Upstream commit e542087701f09418702673631a908429feb3eae0 ]

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>
Reviewed-by: Boris Brezillon <boris.brezillon@...tlin.com>
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 88b1897aeb40f..7826f7c4ec2fb 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);
-- 
2.20.1