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7f1b63f981
When cleaning up defrag inodes at btrfs_cleanup_defrag_inodes(), called
during remount and unmount, we are freeing every node from the rbtree
that tracks inodes for auto defrag using
rbtree_postorder_for_each_entry_safe(), which doesn't modify the tree
itself. So once we unlock the lock that protects the rbtree, we have a
tree pointing to a root that was freed (and a root pointing to freed
nodes, and their children pointing to other freed nodes, and so on).
This makes further access to the tree result in a use-after-free with
unpredictable results.
Fix this by initializing the rbtree to an empty root after the call to
rbtree_postorder_for_each_entry_safe() and before unlocking.
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.