diff options
| author | Josef Bacik <jbacik@fusionio.com> | 2013-05-17 20:06:51 +0200 |
|---|---|---|
| committer | Josef Bacik <jbacik@fusionio.com> | 2013-05-18 03:40:38 +0200 |
| commit | 655b09fe540b73edeaabfb4c2d700be51a1f8bce (patch) | |
| tree | ee5239ddbadcd4aed7266f61653e28e990bb2978 | |
| parent | Btrfs: explicitly use global_block_rsv for quota_tree (diff) | |
| download | linux-655b09fe540b73edeaabfb4c2d700be51a1f8bce.tar.xz linux-655b09fe540b73edeaabfb4c2d700be51a1f8bce.zip | |
Btrfs: make sure roots are assigned before freeing their nodes
If we fail to load the chunk tree we'll call free_root_pointers, except we may
not have assigned the roots for the dev_root/extent_root/csum_root yet, so we
could NULL pointer deref at this point. Just add checks to make sure these
roots are set to keep us from panicing. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
| -rw-r--r-- | fs/btrfs/disk-io.c | 39 |
1 files changed, 21 insertions, 18 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 1b03f8393a69..4bdb0528688a 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1987,30 +1987,33 @@ static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root) { free_extent_buffer(info->tree_root->node); free_extent_buffer(info->tree_root->commit_root); - free_extent_buffer(info->dev_root->node); - free_extent_buffer(info->dev_root->commit_root); - free_extent_buffer(info->extent_root->node); - free_extent_buffer(info->extent_root->commit_root); - free_extent_buffer(info->csum_root->node); - free_extent_buffer(info->csum_root->commit_root); - if (info->quota_root) { - free_extent_buffer(info->quota_root->node); - free_extent_buffer(info->quota_root->commit_root); - } - info->tree_root->node = NULL; info->tree_root->commit_root = NULL; - info->dev_root->node = NULL; - info->dev_root->commit_root = NULL; - info->extent_root->node = NULL; - info->extent_root->commit_root = NULL; - info->csum_root->node = NULL; - info->csum_root->commit_root = NULL; + + if (info->dev_root) { + free_extent_buffer(info->dev_root->node); + free_extent_buffer(info->dev_root->commit_root); + info->dev_root->node = NULL; + info->dev_root->commit_root = NULL; + } + if (info->extent_root) { + free_extent_buffer(info->extent_root->node); + free_extent_buffer(info->extent_root->commit_root); + info->extent_root->node = NULL; + info->extent_root->commit_root = NULL; + } + if (info->csum_root) { + free_extent_buffer(info->csum_root->node); + free_extent_buffer(info->csum_root->commit_root); + info->csum_root->node = NULL; + info->csum_root->commit_root = NULL; + } if (info->quota_root) { + free_extent_buffer(info->quota_root->node); + free_extent_buffer(info->quota_root->commit_root); info->quota_root->node = NULL; info->quota_root->commit_root = NULL; } - if (chunk_root) { free_extent_buffer(info->chunk_root->node); free_extent_buffer(info->chunk_root->commit_root); |