[syzbot] linux-next boot error: general protection fault in add_mtd_device

[Tetsuo Handa]

mtd_check_of_node() was added by commit ad9b10d1eaada169 ("mtd: core:
introduce of support for dynamic partitions").

I guess that sometimes (depending on probe timing) mtd->parent is NULL.
Please check what mtd->parent == NULL means.

+	/* Check if a partitions node exist */
+       parent = mtd->parent;
+       parent_dn = dev_of_node(&parent->dev);

On 2022/06/30 18:32, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    6cc11d2a1759 Add linux-next specific files for 20220630
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1640f850080000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=54f75b620e3845dd
> dashboard link: https://syzkaller.appspot.com/bug?extid=fe013f55a2814a9e8cfd
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+fe013f55a2814a9e8cfd at syzkaller.appspotmail.com