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Btrfs: add error handling for extent buffer in print tree

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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 <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2016-09-14 17:23:39 -07:00 committed by David Sterba
parent a43f7f8206
commit a42cbec9c6
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/print-tree.c
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@ -356,6 +356,13 @@ void btrfs_print_tree(struct btrfs_root *root, struct extent_buffer *c)
struct extent_buffer *next = read_tree_block(root, struct extent_buffer *next = read_tree_block(root,
btrfs_node_blockptr(c, i), btrfs_node_blockptr(c, i),
btrfs_node_ptr_generation(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) && if (btrfs_is_leaf(next) &&
level != 1) level != 1)
BUG(); BUG();