Subject: [PATCH 4.14 183/209] mtd: rawnand: atmel: fix possible object reference leak

From: Greg Kroah-Hartman <[email-masked]>
Date: Wed, 4 Dec 2019 18:56:35 +0100

From: Wen Yang <[email-masked]>

commit a12085d13997ed15f745f33a0e01002541160179 upstream.

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: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
Signed-off-by: Wen Yang <[email-masked]>
Suggested-by: Boris Brezillon <[email-masked]>
Reviewed-by: Boris Brezillon <[email-masked]>
Reviewed-by: Miquel Raynal <[email-masked]>
Acked-by: Miquel Raynal <[email-masked]>
Cc: Tudor Ambarus <[email-masked]>
Cc: Boris Brezillon <[email-masked]>
Cc: Miquel Raynal <[email-masked]>
Cc: Richard Weinberger <[email-masked]>
Cc: David Woodhouse <[email-masked]>
Cc: Brian Norris <[email-masked]>
Cc: Marek Vasut <[email-masked]>
Cc: Nicolas Ferre <[email-masked]>
Cc: Alexandre Belloni <[email-masked]>
Cc: Ludovic Desroches <[email-masked]>
Cc: [email-masked]
Cc: [email-masked]
Cc: [email-masked]
Signed-off-by: Miquel Raynal <[email-masked]>
Signed-off-by: Lee Jones <[email-masked]>
Signed-off-by: Greg Kroah-Hartman <[email-masked]>

---
 drivers/mtd/nand/atmel/pmecc.c |   21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

--- a/drivers/mtd/nand/atmel/pmecc.c
+++ b/drivers/mtd/nand/atmel/pmecc.c
@@ -875,23 +875,32 @@ static struct atmel_pmecc *atmel_pmecc_g
 {
 	struct platform_device *pdev;
 	struct atmel_pmecc *pmecc, **ptr;
+	int ret;
 
 	pdev = of_find_device_by_node(np);
-	if (!pdev || !platform_get_drvdata(pdev))
+	if (!pdev)
 		return ERR_PTR(-EPROBE_DEFER);
+	pmecc = platform_get_drvdata(pdev);
+	if (!pmecc) {
+		ret = -EPROBE_DEFER;
+		goto err_put_device;
+	}
 
 	ptr = devres_alloc(devm_atmel_pmecc_put, sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return ERR_PTR(-ENOMEM);
-
-	get_device(&pdev->dev);
-	pmecc = platform_get_drvdata(pdev);
+	if (!ptr) {
+		ret = -ENOMEM;
+		goto err_put_device;
+	}
 
 	*ptr = pmecc;
 
 	devres_add(userdev, ptr);
 
 	return pmecc;
+
+err_put_device:
+	put_device(&pdev->dev);
+	return ERR_PTR(ret);
 }
 
 static const int atmel_pmecc_strengths[] = { 2, 4, 8, 12, 24, 32 };

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