Should check if functions returns NULL or not.
Signed-off-by: Tsutomu Itoh <t-itoh@xxxxxxxxxxxxxx>
---
fs/btrfs/ctree.c | 6 ++++++
fs/btrfs/disk-io.c | 8 ++++++++
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 9ac1715..f68c6ff 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -2514,6 +2514,9 @@ 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);
@@ -2764,6 +2767,9 @@ 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 a5d2249..5ede105 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 5e7a94d..d05c5d2 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3072,6 +3072,8 @@ 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);
--
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