From a42cbec9c662ced87f1d0f22a1c114de4cf6e352 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Wed, 14 Sep 2016 17:23:39 -0700 Subject: [PATCH] Btrfs: add error handling for extent buffer in print tree Somehow we missed btrfs_print_tree when last time we updated error handling for read_extent_block(). This keeps us from getting a NULL pointer panic when btrfs_print_tree's read_extent_block() fails. Signed-off-by: Liu Bo Signed-off-by: David Sterba --- fs/btrfs/print-tree.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c index 147dc6ca5de1..aaeee45d917d 100644 --- a/fs/btrfs/print-tree.c +++ b/fs/btrfs/print-tree.c @@ -356,6 +356,13 @@ void btrfs_print_tree(struct btrfs_root *root, struct extent_buffer *c) struct extent_buffer *next = read_tree_block(root, btrfs_node_blockptr(c, i), btrfs_node_ptr_generation(c, i)); + if (IS_ERR(next)) { + continue; + } else if (!extent_buffer_uptodate(next)) { + free_extent_buffer(next); + continue; + } + if (btrfs_is_leaf(next) && level != 1) BUG(); -- 2.20.1