linux-kernel - Re: [syzbot] [efi?] [fs?] BUG: unable to handle kernel paging request in efivarfs_pm

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Message-ID: <CAMj1kXG1mhe1_eB0oeWukpA_FMTzH5F6zFFszpDTr_x2smvzig@mail.gmail.com>
Date: Sun, 23 Feb 2025 16:45:17 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: syzbot <syzbot+00d13e505ef530a45100@...kaller.appspotmail.com>
Cc: jk@...abs.org, linux-efi@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [efi?] [fs?] BUG: unable to handle kernel paging request
 in efivarfs_pm_notify

#syz test:
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci

--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -367,6 +367,8 @@ static int efivarfs_fill_super(struct super_block
*sb, struct fs_context *fc)
        if (err)
                return err;

+       register_pm_notifier(&sfi->pm_nb);
+
        return efivar_init(efivarfs_callback, sb, true);
 }

@@ -552,7 +554,6 @@ static int efivarfs_init_fs_context(struct fs_context *fc)

        sfi->pm_nb.notifier_call = efivarfs_pm_notify;
        sfi->pm_nb.priority = 0;
-       register_pm_notifier(&sfi->pm_nb);

        return 0;
 }