summaryrefslogtreecommitdiffstats
path: root/fs/btrfs
diff options
context:
space:
mode:
authorLiu Bo <bo.li.liu@oracle.com>2017-10-30 11:14:38 -0600
committerDavid Sterba <dsterba@suse.com>2017-11-15 14:47:01 +0100
commit56a0e706fcf870270878d6d72b71092ae42d229c (patch)
treeb805b64c6152ce3c2f228405e62847960601bed2 /fs/btrfs
parent619c47f3d4cd7a60576fd15e133a2eee4fcc0c4e (diff)
downloadlinux-56a0e706fcf870270878d6d72b71092ae42d229c.tar.bz2
Btrfs: bail out gracefully rather than BUG_ON
If a file's DIR_ITEM key is invalid (due to memory errors) and gets written to disk, a future lookup_path can end up with kernel panic due to BUG_ON(). This gets rid of the BUG_ON(), meanwhile output the corrupted key and return ENOENT if it's invalid. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reported-by: Guillaume Bouchard <bouchard@mercs-eng.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/inode.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8525a44a607e..1131db7a0b28 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5445,6 +5445,14 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
goto out_err;
btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
+ if (location->type != BTRFS_INODE_ITEM_KEY &&
+ location->type != BTRFS_ROOT_ITEM_KEY) {
+ btrfs_warn(root->fs_info,
+"%s gets something invalid in DIR_ITEM (name %s, directory ino %llu, location(%llu %u %llu))",
+ __func__, name, btrfs_ino(BTRFS_I(dir)),
+ location->objectid, location->type, location->offset);
+ goto out_err;
+ }
out:
btrfs_free_path(path);
return ret;
@@ -5761,8 +5769,6 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
return inode;
}
- BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY);
-
index = srcu_read_lock(&fs_info->subvol_srcu);
ret = fixup_tree_root_location(fs_info, dir, dentry,
&location, &sub_root);