[PATCH v4] mtd: spi-nor: fix memory leak when using debugfs_lookup()

Michael Walle michael at walle.cc
Wed Feb 8 08:15:41 PST 2023

Am 2023-02-08 17:02, schrieb Greg Kroah-Hartman:
> When calling debugfs_lookup() the result must have dput() called on it,
> otherwise the memory will leak over time.  To solve this, remove the
> lookup and create the directory on the first device found, and then
> remove it when the module is unloaded.
> Cc: Tudor Ambarus <tudor.ambarus at microchip.com>
> Cc: Pratyush Yadav <pratyush at kernel.org>
> Cc: Michael Walle <michael at walle.cc>
> Cc: Miquel Raynal <miquel.raynal at bootlin.com>
> Cc: Richard Weinberger <richard at nod.at>
> Cc: Vignesh Raghavendra <vigneshr at ti.com>
> Cc: linux-mtd at lists.infradead.org
> Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

Reviewed-by: Michael Walle <michael at walle.cc>

one nit below I didn't notice earlier, no need to send a new
patch version just for that.


> +void spi_nor_debugfs_shutdown(void)
> +{
> +	if (rootdir)
> +		debugfs_remove(rootdir);

debugfs_remove() already has a check for NULL.

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