linux-kernel - [PATCH 4.4 23/92] ubi: Put MTD device after it is not used

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Message-Id: <20191204174331.454409380@linuxfoundation.org>
Date:   Wed,  4 Dec 2019 18:49:23 +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>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 23/92] ubi: Put MTD device after it is not used

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

[ Upstream commit b95f83ab762dd6211351b9140f99f43644076ca8 ]

The MTD device reference is dropped via put_mtd_device, however its
field ->index is read and passed to ubi_msg. To fix this, the patch
moves the reference dropping after calling ubi_msg.

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/build.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index c9f5ae424af75..ae8e55b4f6f93 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1141,10 +1141,10 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
 	ubi_wl_close(ubi);
 	ubi_free_internal_volumes(ubi);
 	vfree(ubi->vtbl);
-	put_mtd_device(ubi->mtd);
 	vfree(ubi->peb_buf);
 	vfree(ubi->fm_buf);
 	ubi_msg(ubi, "mtd%d is detached", ubi->mtd->index);
+	put_mtd_device(ubi->mtd);
 	put_device(&ubi->dev);
 	return 0;
 }
-- 
2.20.1