FAILED: patch "[PATCH] mtd: core: check partition before dereference" failed to apply to 5.19-stable tree

The patch below does not apply to the 5.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 7ec4cdb321738d44ae5d405e7b6ac73dfbf99caa Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <[email protected]>
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.

index 6fafea80fd98..a9b8be9f40dc 100644
@@ -559,6 +559,8 @@ static void mtd_check_of_node(struct mtd_info *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)