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authorTsutomu Itoh <t-itoh@jp.fujitsu.com>2011-01-05 02:32:22 +0000
committerChris Mason <chris.mason@oracle.com>2011-01-16 11:30:20 -0500
commit91ca338d776e0cefb255bf2979b6448febd880f5 (patch)
tree5d1d344d6ed565faf5612b5c695f00c04e6f01d8 /fs/btrfs
parentff175d57f057f77d2d3031d674c2af9167a4af02 (diff)
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/btrfs')
-rw-r--r--fs/btrfs/ctree.c6
-rw-r--r--fs/btrfs/disk-io.c8
-rw-r--r--fs/btrfs/extent_io.c2
3 files changed, 16 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 99599f1c155..b5baff0dccf 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 f9efb68fc2e..a0c37b2ee9e 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 f1d19812895..8b8d3d99ae6 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);