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[ Upstream commit f6d2a5c263afca84646cf3300dc13061bedbd99e ] Inspired by btrfs-progs github issue #208, where chunk item in chunk tree has invalid num_stripes (0). Although that can already be caught by current btrfs_check_chunk_valid(), that function doesn't really check item size as it needs to handle chunk item in super block sys_chunk_array(). This patch will add two extra checks for chunk items in chunk tree: - Basic chunk item size If the item is smaller than btrfs_chunk (which already contains one stripe), exit right now as reading num_stripes may even go beyond eb boundary. - Item size check against num_stripes If item size doesn't match with calculated chunk size, then either the item size or the num_stripes is corrupted. Error out anyway. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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 Restructured Text 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.