Btrfs: check return value of read_tree_block()
This patch is checking return value of read_tree_block(),
and if it is NULL, error processing.
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 a6a8159..5bc658a 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6067,6 +6067,8 @@
if (reada && level == 1)
reada_walk_down(trans, root, wc, path);
next = read_tree_block(root, bytenr, blocksize, generation);
+ if (!next)
+ return -EIO;
btrfs_tree_lock(next);
btrfs_set_lock_blocking(next);
}
@@ -7937,6 +7939,10 @@
eb = read_tree_block(found_root, block_start,
block_size, 0);
+ if (!eb) {
+ ret = -EIO;
+ goto out;
+ }
btrfs_tree_lock(eb);
BUG_ON(level != btrfs_header_level(eb));