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* [PATCH v3 2/3] mtd: rawnand: jz4780: fix possible object reference leak
       [not found] <1549511278-7735-1-git-send-email-yellowriver2010@hotmail.com>
@ 2019-02-07  3:52 ` Wen Yang
  2019-02-07  3:52 ` [PATCH v3 3/3] mtd: rawnand: mtk: " Wen Yang
  1 sibling, 0 replies; 2+ messages in thread
From: Wen Yang @ 2019-02-07  3:52 UTC (permalink / raw)
  To: tudor.ambarus, bbrezillon, miquel.raynal, richard, dwmw2,
	computersforpeace, marek.vasut
  Cc: alexandre.belloni, Wen Yang, nicolas.ferre, linux-kernel,
	ludovic.desroches, Harvey Hunt, linux-mtd, linux-arm-kernel

of_find_device_by_node() takes a reference to the struct device
when it finds a match via get_device, there is no need to call
get_device() twice.
We also should make sure to drop the reference to the device
taken by of_find_device_by_node() on driver unbind.

Fixes: ae02ab00aa3c ("mtd: nand: jz4780: driver for NAND devices on JZ4780 SoCs")
Signed-off-by: Wen Yang <yellowriver2010@hotmail.com>
Suggested-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Harvey Hunt <harveyhuntnexus@gmail.com>
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: linux-mtd@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
v3->v2: Avoid two times of calling grtform_get_drvdata()
v2->v1: Since there is the only one user, let's remove the err_put_device label.

 drivers/mtd/nand/raw/jz4780_bch.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/jz4780_bch.c b/drivers/mtd/nand/raw/jz4780_bch.c
index 7201827..7aab851 100644
--- a/drivers/mtd/nand/raw/jz4780_bch.c
+++ b/drivers/mtd/nand/raw/jz4780_bch.c
@@ -281,12 +281,14 @@ static struct jz4780_bch *jz4780_bch_get(struct device_node *np)
 	struct jz4780_bch *bch;
 
 	pdev = of_find_device_by_node(np);
-	if (!pdev || !platform_get_drvdata(pdev))
+	if (!pdev)
 		return ERR_PTR(-EPROBE_DEFER);
-
-	get_device(&pdev->dev);
-
 	bch = platform_get_drvdata(pdev);
+	if (!bch) {
+		put_device(&pdev->dev);
+		return ERR_PTR(-EPROBE_DEFER);
+	}
+
 	clk_prepare_enable(bch->clk);
 
 	return bch;
-- 
2.7.4


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 2+ messages in thread

* [PATCH v3 3/3] mtd: rawnand: mtk: fix possible object reference leak
       [not found] <1549511278-7735-1-git-send-email-yellowriver2010@hotmail.com>
  2019-02-07  3:52 ` [PATCH v3 2/3] mtd: rawnand: jz4780: fix possible object reference leak Wen Yang
@ 2019-02-07  3:52 ` " Wen Yang
  1 sibling, 0 replies; 2+ messages in thread
From: Wen Yang @ 2019-02-07  3:52 UTC (permalink / raw)
  To: tudor.ambarus, bbrezillon, miquel.raynal, richard, dwmw2,
	computersforpeace, marek.vasut
  Cc: alexandre.belloni, Wen Yang, nicolas.ferre, linux-kernel,
	ludovic.desroches, linux-mtd, Matthias Brugger, linux-mediatek,
	Xiaolei Li, linux-arm-kernel

of_find_device_by_node() takes a reference to the struct device
when it finds a match via get_device, there is no need to call
get_device() twice.
We also should make sure to drop the reference to the device
taken by of_find_device_by_node() on driver unbind.

Fixes: 1d6b1e464950 ("mtd: mediatek: driver for MTK Smart Device")
Signed-off-by: Wen Yang <yellowriver2010@hotmail.com>
Suggested-by: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Xiaolei Li <xiaolei.li@mediatek.com>
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: linux-mtd@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mediatek@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
v3->v2: Avoid two times of calling grtform_get_drvdata()
v2->v1: Since there is the only one user, let's remove the err_put_device label.

 drivers/mtd/nand/raw/mtk_ecc.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/mtk_ecc.c b/drivers/mtd/nand/raw/mtk_ecc.c
index 6432bd7..db804fe 100644
--- a/drivers/mtd/nand/raw/mtk_ecc.c
+++ b/drivers/mtd/nand/raw/mtk_ecc.c
@@ -267,11 +267,14 @@ static struct mtk_ecc *mtk_ecc_get(struct device_node *np)
 	struct mtk_ecc *ecc;
 
 	pdev = of_find_device_by_node(np);
-	if (!pdev || !platform_get_drvdata(pdev))
+	if (!pdev)
 		return ERR_PTR(-EPROBE_DEFER);
-
-	get_device(&pdev->dev);
 	ecc = platform_get_drvdata(pdev);
+	if (!ecc) {
+		put_device(&pdev->dev);
+		return ERR_PTR(-EPROBE_DEFER);
+	}
+
 	clk_prepare_enable(ecc->clk);
 	mtk_ecc_hw_init(ecc);
 
-- 
2.7.4


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

^ permalink raw reply	[flat|nested] 2+ messages in thread

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     [not found] <1549511278-7735-1-git-send-email-yellowriver2010@hotmail.com>
2019-02-07  3:52 ` [PATCH v3 2/3] mtd: rawnand: jz4780: fix possible object reference leak Wen Yang
2019-02-07  3:52 ` [PATCH v3 3/3] mtd: rawnand: mtk: " Wen Yang

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