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In btrfs_full_stripe_len/btrfs_is_parity_mirror we have similar code which gets the chunk map for a particular range via get_chunk_map. However, get_chunk_map can return an ERR_PTR value and while the 2 callers do catch this with a WARN_ON they then proceed to indiscriminately dereference the extent map. This of course leads to a crash. Fix the offenders by making the dereference conditional on IS_ERR. Signed-off-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.