Patch "btrfs: reject unknown mount options early" has been added to the 4.19-stable tree

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This is a note to let you know that I've just added the patch titled

    btrfs: reject unknown mount options early

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     btrfs-reject-unknown-mount-options-early.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 5f521494cc73520ffac18ede0758883b9aedd018 Mon Sep 17 00:00:00 2001
From: Qu Wenruo <wqu@xxxxxxxx>
Date: Wed, 27 Sep 2023 10:43:15 +0930
Subject: btrfs: reject unknown mount options early

From: Qu Wenruo <wqu@xxxxxxxx>

commit 5f521494cc73520ffac18ede0758883b9aedd018 upstream.

[BUG]
The following script would allow invalid mount options to be specified
(although such invalid options would just be ignored):

  # mkfs.btrfs -f $dev
  # mount $dev $mnt1		<<< Successful mount expected
  # mount $dev $mnt2 -o junk	<<< Failed mount expected
  # echo $?
  0

[CAUSE]
For the 2nd mount, since the fs is already mounted, we won't go through
open_ctree() thus no btrfs_parse_options(), but only through
btrfs_parse_subvol_options().

However we do not treat unrecognized options from valid but irrelevant
options, thus those invalid options would just be ignored by
btrfs_parse_subvol_options().

[FIX]
Add the handling for Opt_err to handle invalid options and error out,
while still ignore other valid options inside btrfs_parse_subvol_options().

Reported-by: Anand Jain <anand.jain@xxxxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx # 4.14+
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/btrfs/super.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -991,6 +991,10 @@ static int btrfs_parse_subvol_options(co
 		case Opt_subvolrootid:
 			pr_warn("BTRFS: 'subvolrootid' mount option is deprecated and has no effect\n");
 			break;
+		case Opt_err:
+			btrfs_err(NULL, "unrecognized mount option '%s'", p);
+			error = -EINVAL;
+			goto out;
 		default:
 			break;
 		}


Patches currently in stable-queue which might be from wqu@xxxxxxxx are

queue-4.19/btrfs-reject-unknown-mount-options-early.patch



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