Subject: Patch "mtd: rawnand: atmel: fix possible object reference leak" has been added to the 4.14-stable tree

From: <[email-masked]>
Date: Tue, 03 Dec 2019 13:30:43 +0100

This is a note to let you know that I've just added the patch titled

    mtd: rawnand: atmel: fix possible object reference leak

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mtd-rawnand-atmel-fix-possible-object-reference-leak.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <[email-masked]> know about it.

>From a12085d13997ed15f745f33a0e01002541160179 Mon Sep 17 00:00:00 2001
From: Wen Yang <[email-masked]>
Date: Thu, 7 Feb 2019 03:50:55 +0000
Subject: mtd: rawnand: atmel: fix possible object reference leak

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 };

Patches currently in stable-queue which might be from [email-masked] are

queue-4.14/mtd-rawnand-atmel-fix-possible-object-reference-leak.patch

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