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Filipe Manana d115fc9e96 btrfs: don't skip remaining extrefs if dir not found during log replay 
commit 24e066ded4 upstream.

During log replay, at add_inode_ref(), if we have an extref item that
contains multiple extrefs and one of them points to a directory that does
not exist in the subvolume tree, we are supposed to ignore it and process
the remaining extrefs encoded in the extref item, since each extref can
point to a different parent inode. However when that happens we just
return from the function and ignore the remaining extrefs.

The problem has been around since extrefs were introduced, in commit
f186373fef ("btrfs: extended inode refs"), but it's hard to hit in
practice because getting extref items encoding multiple extref requires
getting a hash collision when computing the offset of the extref's
key. The offset if computed like this:

  key.offset = btrfs_extref_hash(dir_ino, name->name, name->len);

and btrfs_extref_hash() is just a wrapper around crc32c().

Fix this by moving to next iteration of the loop when we don't find
the parent directory that an extref points to.

Fixes: f186373fef ("btrfs: extended inode refs")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-08-20 18:30:53 +02:00
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README 

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.