[PATCH] mtd: rawnand: oxnas: Add of_node_put()

[PATCH] mtd: rawnand: oxnas: Add of_node_put()

[Nishka Dasgupta]

Each iteration of for_each_child_of_node puts the previous node, but in
the case of a goto from the middle of the loop, there is no put, thus
causing a memory leak. Hence add an of_node_put under a new goto to put
the node at a loop exit.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
---
 drivers/mtd/nand/raw/oxnas_nand.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/oxnas_nand.c b/drivers/mtd/nand/raw/oxnas_nand.c
index 30c51f772de6..c43cb4d92d3d 100644
--- a/drivers/mtd/nand/raw/oxnas_nand.c
+++ b/drivers/mtd/nand/raw/oxnas_nand.c
@@ -116,7 +116,7 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 				    GFP_KERNEL);
 		if (!chip) {
 			err = -ENOMEM;
-			goto err_clk_unprepare;
+			goto err_release_child;
 		}
 
 		chip->controller = &oxnas->base;
@@ -137,12 +137,12 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 		/* Scan to find existence of the device */
 		err = nand_scan(chip, 1);
 		if (err)
-			goto err_clk_unprepare;
+			goto err_release_child;
 
 		err = mtd_device_register(mtd, NULL, 0);
 		if (err) {
 			nand_release(chip);
-			goto err_clk_unprepare;
+			goto err_release_child;
 		}
 
 		oxnas->chips[nchips] = chip;
@@ -159,6 +159,8 @@ static int oxnas_nand_probe(struct platform_device *pdev)
 
 	return 0;
 
+err_release_child:
+	of_node_put(nand_np);
 err_clk_unprepare:
 	clk_disable_unprepare(oxnas->clk);
 	return err;
-- 
2.19.1


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Re: [PATCH] mtd: rawnand: oxnas: Add of_node_put()

[Miquel Raynal]

On Tue, 2019-07-09 at 17:10:16 UTC, Nishka Dasgupta wrote:
> Each iteration of for_each_child_of_node puts the previous node, but in
> the case of a goto from the middle of the loop, there is no put, thus
> causing a memory leak. Hence add an of_node_put under a new goto to put
> the node at a loop exit.
> Issue found with Coccinelle.
> 
> Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel

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