[PATCH 5.10 183/226] btrfs: reject unknown mount options early

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

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
@@ -1123,6 +1123,10 @@ static int btrfs_parse_subvol_options(co
 
 			*subvol_objectid = subvolid;
 			break;
+		case Opt_err:
+			btrfs_err(NULL, "unrecognized mount option '%s'", p);
+			error = -EINVAL;
+			goto out;
 		default:
 			break;
 		}





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