linux-kernel - [PATCH 3/3] mtd: maps: vmu-flash: Fix NULL pointer dereference in initialization

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Message-ID: <20251117224408.498449-4-fuchsfl@gmail.com>
Date: Mon, 17 Nov 2025 23:44:08 +0100
From: Florian Fuchs <fuchsfl@...il.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>,
	linux-mtd@...ts.infradead.org
Cc: linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Rich Felker <dalias@...c.org>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	Florian Fuchs <fuchsfl@...il.com>
Subject: [PATCH 3/3] mtd: maps: vmu-flash: Fix NULL pointer dereference in initialization

The mtd_info contains a struct device, which must be linked to its
parent. Without this, the initialization of the MTD fails with a NULL
pointer dereference.

Signed-off-by: Florian Fuchs <fuchsfl@...il.com>
---
 drivers/mtd/maps/vmu-flash.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/maps/vmu-flash.c b/drivers/mtd/maps/vmu-flash.c
index d0793f1b0fac..153ba6f8f769 100644
--- a/drivers/mtd/maps/vmu-flash.c
+++ b/drivers/mtd/maps/vmu-flash.c
@@ -547,6 +547,7 @@ static void vmu_queryblocks(struct mapleq *mq)
 	mpart->partition = card->partition;
 	mtd_cur->priv = mpart;
 	mtd_cur->owner = THIS_MODULE;
+	mtd_cur->dev.parent = &mdev->dev;
 
 	pcache = kzalloc(sizeof(struct vmu_cache), GFP_KERNEL);
 	if (!pcache)
-- 
2.43.0