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| author | Miao Xie <miaox@cn.fujitsu.com> | 2010-03-25 12:37:12 +0000 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2010-03-30 21:19:08 -0400 |
| commit | 90d2c51dbb4db05c040bc7db264bb7ab35e35455 (patch) | |
| tree | d97b50f0a064366aecce9671b8e1791263999e59 | |
| parent | 2f3014fc2ab1e25c36531e19164c48182c168995 (diff) | |
| download | linux-90d2c51dbb4db05c040bc7db264bb7ab35e35455.tar.gz linux-90d2c51dbb4db05c040bc7db264bb7ab35e35455.tar.bz2 linux-90d2c51dbb4db05c040bc7db264bb7ab35e35455.zip | |
Btrfs: add NULL check for do_walk_down()
btrfs_find_create_tree_block() may return NULL, so we must check the returned
value, or we will access a NULL pointer.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/extent-tree.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 1727b26fb194..503a18eaef52 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -5205,6 +5205,8 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans, next = btrfs_find_tree_block(root, bytenr, blocksize); if (!next) { next = btrfs_find_create_tree_block(root, bytenr, blocksize); + if (!next) + return -ENOMEM; reada = 1; } btrfs_tree_lock(next); @@ -5417,7 +5419,8 @@ static noinline int walk_down_tree(struct btrfs_trans_handle *trans, if (ret > 0) { path->slots[level]++; continue; - } + } else if (ret < 0) + return ret; level = wc->level; } return 0; |