btrfs: checking NULL or not in some functions
Because NULL is returned when the memory allocation fails,
it is checked whether it is NULL.
Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index f96641a..9de4ff0 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6496,6 +6496,8 @@
int ret = 0;
ra = kzalloc(sizeof(*ra), GFP_NOFS);
+ if (!ra)
+ return -ENOMEM;
mutex_lock(&inode->i_mutex);
first_index = start >> PAGE_CACHE_SHIFT;
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 6411ed6..8862dda 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1920,6 +1920,8 @@
nr = bio_get_nr_vecs(bdev);
bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH);
+ if (!bio)
+ return -ENOMEM;
bio_add_page(bio, page, page_size, offset);
bio->bi_end_io = end_io_func;
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 42dfc30..6d66e5c 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -2751,7 +2751,13 @@
log = root->log_root;
path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
dst_path = btrfs_alloc_path();
+ if (!dst_path) {
+ btrfs_free_path(path);
+ return -ENOMEM;
+ }
min_key.objectid = inode->i_ino;
min_key.type = BTRFS_INODE_ITEM_KEY;