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| author | Daniel J Blueman <daniel.blueman@gmail.com> | 2011-06-23 23:01:01 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.cz> | 2011-10-20 18:10:50 +0200 |
| commit | 068132bad1de70f85f5f6d12c36d64f8f7848d92 (patch) | |
| tree | 7e4a4a164b8153cf463662fbc2ce00f5671f4fa6 | |
| parent | 60d2adbb1e7fee1cb4bc67f70bd0bd8ace7b6c3c (diff) | |
btrfs: fix oops on failure path
If lookup_extent_backref fails, path->nodes[0] reasonably could be
null along with other callers of btrfs_print_leaf, so ensure we have a
valid extent buffer before dereferencing.
Signed-off-by: Daniel J Blueman <daniel.blueman@gmail.com>
| -rw-r--r-- | fs/btrfs/print-tree.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c index fb2605d998e9..f38e452486b8 100644 --- a/fs/btrfs/print-tree.c +++ b/fs/btrfs/print-tree.c @@ -158,8 +158,7 @@ static void print_extent_ref_v0(struct extent_buffer *eb, int slot) void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l) { int i; - u32 type; - u32 nr = btrfs_header_nritems(l); + u32 type, nr; struct btrfs_item *item; struct btrfs_root_item *ri; struct btrfs_dir_item *di; @@ -172,6 +171,11 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l) struct btrfs_key key; struct btrfs_key found_key; + if (!l) + return; + + nr = btrfs_header_nritems(l); + printk(KERN_INFO "leaf %llu total ptrs %d free space %d\n", (unsigned long long)btrfs_header_bytenr(l), nr, btrfs_leaf_free_space(root, l)); |