--- /dev/null
+From 7ec4cdb321738d44ae5d405e7b6ac73dfbf99caa Mon Sep 17 00:00:00 2001
+From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
+Date: Mon, 25 Jul 2022 22:49:25 +0900
+Subject: [PATCH] mtd: core: check partition before dereference
+
+syzbot is reporting NULL pointer dereference at mtd_check_of_node() [1],
+for mtdram test device (CONFIG_MTD_MTDRAM) is not partition.
+
+Link: https://syzkaller.appspot.com/bug?extid=fe013f55a2814a9e8cfd [1]
+Reported-by: syzbot <syzbot+fe013f55a2814a9e8cfd@syzkaller.appspotmail.com>
+Reported-by: kernel test robot <oliver.sang@intel.com>
+Fixes: ad9b10d1eaada169 ("mtd: core: introduce of support for dynamic partitions")
+Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
+CC: stable@vger.kernel.org
+Signed-off-by: Richard Weinberger <richard@nod.at>
+---
+ drivers/mtd/mtdcore.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/mtd/mtdcore.c
++++ b/drivers/mtd/mtdcore.c
+@@ -574,6 +574,8 @@ static void mtd_check_of_node(struct mtd
+ return;
+
+ /* Check if a partitions node exist */
++ if (!mtd_is_partition(mtd))
++ return;
+ parent = mtd->parent;
+ parent_dn = dev_of_node(&parent->dev);
+ if (!parent_dn)
#include <linux/nvmem-provider.h>
#include <linux/mtd/mtd.h>
-@@ -765,6 +766,19 @@ int add_mtd_device(struct mtd_info *mtd)
+@@ -767,6 +768,19 @@ int add_mtd_device(struct mtd_info *mtd)
of this try_ nonsense, and no bitching about it
either. :) */
__module_get(THIS_MODULE);