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Before this patch, the inode glock's gl_object was set after a reference was acquired, but before the block type was verified. In cases where the block was unlinked, then freed and reused on another node, a residule delete callback (delete_work) would try to look up the inode, eventually failing the block check, but only after it overwrites gl_object with a pointer to the wrong inode. This patch moves the assignment of gl_object after the block check so it won't be improperly overwritten. Likewise, at the end of the function, gfs2_inode_lookup was clearing gl_object after it unlocked the glock, which meant another process might free the glock in the meantime. This patch guards against that case. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Reviewed-by: Andreas Gruenbacher <agruenba@redhat.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.