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authorJosef Bacik <jbacik@fusionio.com>2013-05-17 14:06:51 -0400
committerJosef Bacik <jbacik@fusionio.com>2013-05-17 21:40:38 -0400
commit655b09fe540b73edeaabfb4c2d700be51a1f8bce (patch)
treeee5239ddbadcd4aed7266f61653e28e990bb2978 /fs
parent3a6cad9009c85e29e83aafc8ac00b1dd5067fc5f (diff)
downloadlinux-655b09fe540b73edeaabfb4c2d700be51a1f8bce.tar.bz2
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/disk-io.c39
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);