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| author |   Tsutomu Itoh <t-itoh@jp.fujitsu.com> | 2011-03-24 06:33:21 +0000 |
|---|---|---|
| committer |   root <Chris Mason chris.mason@oracle.com> | 2011-03-28 05:37:37 -0400 |
| commit | 97d9a8a420444eb5b5c071d4b3b9c4100a7ae015 (patch) | |
| tree | 4ed3e77541ebcc4885c4a10630e2f6bf94d3cef2 /fs | |
| parent | btrfs: properly access unaligned checksum buffer (diff) | |
| download | linux-dev-97d9a8a420444eb5b5c071d4b3b9c4100a7ae015.tar.xz linux-dev-97d9a8a420444eb5b5c071d4b3b9c4100a7ae015.zip | |
Btrfs: check return value of read_tree_block()
This patch is checking return value of read_tree_block(),
and if it is NULL, error processing.
Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/ctree.c | 3 | ||||
| -rw-r--r-- | fs/btrfs/extent-tree.c | 6 | ||||
| -rw-r--r-- | fs/btrfs/relocation.c | 6 |
3 files changed, 15 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 4edcbe915736..84d7ca1fe0ba 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -682,6 +682,8 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans, if (!cur) { cur = read_tree_block(root, blocknr, blocksize, gen); + if (!cur) + return -EIO; } else if (!uptodate) { btrfs_read_buffer(cur, gen); } @@ -4087,6 +4089,7 @@ find_next_key: } btrfs_set_path_blocking(path); cur = read_node_slot(root, cur, slot); + BUG_ON(!cur); btrfs_tree_lock(cur); diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index a6a8159c5d1e..5bc658a9d85c 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -6067,6 +6067,8 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans, if (reada && level == 1) reada_walk_down(trans, root, wc, path); next = read_tree_block(root, bytenr, blocksize, generation); + if (!next) + return -EIO; btrfs_tree_lock(next); btrfs_set_lock_blocking(next); } @@ -7937,6 +7939,10 @@ static noinline int relocate_one_extent(struct btrfs_root *extent_root, eb = read_tree_block(found_root, block_start, block_size, 0); + if (!eb) { + ret = -EIO; + goto out; + } btrfs_tree_lock(eb); BUG_ON(level != btrfs_header_level(eb)); diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index c863c8447015..58250e09eb05 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -1724,6 +1724,7 @@ again: eb = read_tree_block(dest, old_bytenr, blocksize, old_ptr_gen); + BUG_ON(!eb); btrfs_tree_lock(eb); if (cow) { ret = btrfs_cow_block(trans, dest, eb, parent, @@ -2513,6 +2514,10 @@ static int do_relocation(struct btrfs_trans_handle *trans, blocksize = btrfs_level_size(root, node->level); generation = btrfs_node_ptr_generation(upper->eb, slot); eb = read_tree_block(root, bytenr, blocksize, generation); + if (!eb) { + err = -EIO; + goto next; + } btrfs_tree_lock(eb); btrfs_set_lock_blocking(eb); @@ -2670,6 +2675,7 @@ static int get_tree_block_key(struct reloc_control *rc, BUG_ON(block->key_ready); eb = read_tree_block(rc->extent_root, block->bytenr, block->key.objectid, block->key.offset); + BUG_ON(!eb); WARN_ON(btrfs_header_level(eb) != block->level); if (block->level == 0) btrfs_item_key_to_cpu(eb, &block->key, 0); |