Btrfs: Fix for test_range_bit

test_range_bit doesn't properly handle the case: there's a hole at the
end of the range and there's no other extent_state after the range.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index d71aed341abd..485cf0719b3c 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -1336,6 +1336,11 @@ int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
                 if (start > end)
                         break;
                 node = rb_next(node);
+                if (!node) {
+                        if (filled)
+                                bitset = 0;
+                        break;
+                }
         }
         read_unlock_irq(&tree->lock);
         return bitset;