linux-kernel - [PATCH v2] mtd: spi-nor: fix memory leak when using debugfs

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Message-Id: <20230208125758.1515806-1-gregkh@linuxfoundation.org>
Date:   Wed,  8 Feb 2023 13:57:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <pratyush@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, stable <stable@...nel.org>
Subject: [PATCH v2] mtd: spi-nor: fix memory leak when using debugfs_lookup()

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time.

Cc: Tudor Ambarus <tudor.ambarus@...rochip.com>
Cc: Pratyush Yadav <pratyush@...nel.org>
Cc: Michael Walle <michael@...le.cc>
Cc: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: Richard Weinberger <richard@....at>
Cc: Vignesh Raghavendra <vigneshr@...com>
Cc: linux-mtd@...ts.infradead.org
Cc: stable <stable@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
v2: fix up to work when module is removed and added, making the fix
    much simpler.

 drivers/mtd/spi-nor/debugfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/spi-nor/debugfs.c b/drivers/mtd/spi-nor/debugfs.c
index ff895f6758ea..af41fbc09a97 100644
--- a/drivers/mtd/spi-nor/debugfs.c
+++ b/drivers/mtd/spi-nor/debugfs.c
@@ -242,6 +242,7 @@ void spi_nor_debugfs_register(struct spi_nor *nor)
 
 	d = debugfs_create_dir(dev_name(nor->dev), rootdir);
 	nor->debugfs_root = d;
+	dput(rootdir);
 
 	debugfs_create_file("params", 0444, d, nor, &spi_nor_params_fops);
 	debugfs_create_file("capabilities", 0444, d, nor,
-- 
2.39.1