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>
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 99599f1..b5baff0 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -2516,6 +2516,9 @@
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 @@
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 f9efb68..a0c37b2 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -353,6 +353,10 @@
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 @@
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 f1d1981..8b8d3d9 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3075,6 +3075,8 @@
#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);