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| author | Tsutomu Itoh <t-itoh@jp.fujitsu.com> | 2011-01-05 03:32:22 +0100 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-01-16 17:30:20 +0100 |
| commit | 91ca338d776e0cefb255bf2979b6448febd880f5 (patch) | |
| tree | 5d1d344d6ed565faf5612b5c695f00c04e6f01d8 /fs | |
| parent | btrfs: Don't pass NULL ptr to func that may deref it. (diff) | |
| download | linux-91ca338d776e0cefb255bf2979b6448febd880f5.tar.xz linux-91ca338d776e0cefb255bf2979b6448febd880f5.zip | |
btrfs: check NULL or not
Should check if functions returns NULL or not.
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 | 6 | ||||
| -rw-r--r-- | fs/btrfs/disk-io.c | 8 | ||||
| -rw-r--r-- | fs/btrfs/extent_io.c | 2 |
3 files changed, 16 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 99599f1c1554..b5baff0dccfe 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -2516,6 +2516,9 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root btrfs_assert_tree_locked(path->nodes[1]); right = read_node_slot(root, upper, slot + 1); + if (right == NULL) + return 1; + btrfs_tree_lock(right); btrfs_set_lock_blocking(right); @@ -2766,6 +2769,9 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root btrfs_assert_tree_locked(path->nodes[1]); left = read_node_slot(root, path->nodes[1], slot - 1); + if (left == NULL) + return 1; + btrfs_tree_lock(left); btrfs_set_lock_blocking(left); diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index f9efb68fc2e3..a0c37b2ee9ed 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -353,6 +353,10 @@ static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) WARN_ON(len == 0); eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); + if (eb == NULL) { + WARN_ON(1); + goto out; + } ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, btrfs_header_generation(eb)); BUG_ON(ret); @@ -427,6 +431,10 @@ static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, WARN_ON(len == 0); eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); + if (eb == NULL) { + ret = -EIO; + goto out; + } found_start = btrfs_header_bytenr(eb); if (found_start != start) { diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index f1d198128959..8b8d3d99ae68 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3075,6 +3075,8 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree, #endif eb = kmem_cache_zalloc(extent_buffer_cache, mask); + if (eb == NULL) + return NULL; eb->start = start; eb->len = len; spin_lock_init(&eb->lock); |