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/ctree.c b/fs/btrfs/ctree.c
index 4edcbe9..84d7ca1 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -682,6 +682,8 @@
if (!cur) {
cur = read_tree_block(root, blocknr,
blocksize, gen);
+ if (!cur)
+ return -EIO;
} else if (!uptodate) {
btrfs_read_buffer(cur, gen);
}
@@ -4087,6 +4089,7 @@
}
btrfs_set_path_blocking(path);
cur = read_node_slot(root, cur, slot);
+ BUG_ON(!cur);
btrfs_tree_lock(cur);
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));
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index c863c84..58250e0 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -1724,6 +1724,7 @@
eb = read_tree_block(dest, old_bytenr, blocksize,
old_ptr_gen);
+ BUG_ON(!eb);
btrfs_tree_lock(eb);
if (cow) {
ret = btrfs_cow_block(trans, dest, eb, parent,
@@ -2513,6 +2514,10 @@
blocksize = btrfs_level_size(root, node->level);
generation = btrfs_node_ptr_generation(upper->eb, slot);
eb = read_tree_block(root, bytenr, blocksize, generation);
+ if (!eb) {
+ err = -EIO;
+ goto next;
+ }
btrfs_tree_lock(eb);
btrfs_set_lock_blocking(eb);
@@ -2670,6 +2675,7 @@
BUG_ON(block->key_ready);
eb = read_tree_block(rc->extent_root, block->bytenr,
block->key.objectid, block->key.offset);
+ BUG_ON(!eb);
WARN_ON(btrfs_header_level(eb) != block->level);
if (block->level == 0)
btrfs_item_key_to_cpu(eb, &block->key, 0);