btrfs: check unsupported filters in balance arguments

commit 8eb934591f8bf584969454a658f629cd06e59f3a upstream.

We don't verify that all the balance filter arguments supplemented by
the flags are actually known to the kernel. Thus we let it silently pass
and do nothing.

At the moment this means only the 'limit' filter, but we're going to add
a few more soon so it's better to have that fixed. Also in older stable
kernels so that it works with newer userspace tools.

Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 37d456a9a3b8c7c0c61dc3168f711375175485f9..af3dd3c55ef18e416d71cd4672a03141cc57377c 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4492,6 +4492,11 @@ locked:
                bctl->flags |= BTRFS_BALANCE_TYPE_MASK;
        }
 
+       if (bctl->flags & ~(BTRFS_BALANCE_ARGS_MASK | BTRFS_BALANCE_TYPE_MASK)) {
+               ret = -EINVAL;
+               goto out_bargs;
+       }
+
 do_balance:
        /*
         * Ownership of bctl and mutually_exclusive_operation_running

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index ebc31331a83746b23b4e99ac146b25fc03b31cc3..e1cc5b45069af37141427d34eb7a7462e38feb2c 100644 (file)
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -372,6 +372,14 @@ struct map_lookup {
 #define BTRFS_BALANCE_ARGS_VRANGE      (1ULL << 4)
 #define BTRFS_BALANCE_ARGS_LIMIT       (1ULL << 5)
 
+#define BTRFS_BALANCE_ARGS_MASK                        \
+       (BTRFS_BALANCE_ARGS_PROFILES |          \
+        BTRFS_BALANCE_ARGS_USAGE |             \
+        BTRFS_BALANCE_ARGS_DEVID |             \
+        BTRFS_BALANCE_ARGS_DRANGE |            \
+        BTRFS_BALANCE_ARGS_VRANGE |            \
+        BTRFS_BALANCE_ARGS_LIMIT)
+
 /*
  * Profile changing flags.  When SOFT is set we won't relocate chunk if
  * it already has the target profile (even though it may be