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f5af1d5c2d
commit ff4ab5e02a0447dd1e290883eb6cd7d94848e590 upstream. In xfs_bui_item_recover, there exists a use-after-free bug with regards to the inode that is involved in the bmap replay operation. If the mapping operation does not complete, we call xfs_bmap_unmap_extent to create a deferred op to finish the unmapping work, and we retain a pointer to the incore inode. Unfortunately, the very next thing we do is commit the transaction and drop the inode. If reclaim tears down the inode before we try to finish the defer ops, we dereference garbage and blow up. Therefore, create a way to join inodes to the defer ops freezer so that we can maintain the xfs_inode reference until we're done with the inode. Note: This imposes the requirement that there be enough memory to keep every incore inode in memory throughout recovery. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chandan Babu R <chandan.babu@oracle.com> Acked-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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 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.