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Commitc54b386969("VFS: Change vfs_mkdir() to return the dentry.") changed cachefiles_get_directory, replacing "subdir" with a ERR_PTR from the result of cachefiles_inject_write_error, which is either 0 or some error code. This causes an oops when the resulting pointer is passed to vfs_mkdir. Use a similar pattern to what is used earlier in the function; replace subdir with either the return value from vfs_mkdir, or the ERR_PTR of the cachefiles_inject_write_error() return value, but only if it is non zero. Fixes:c54b386969("VFS: Change vfs_mkdir() to return the dentry.") cc: netfs@lists.linux.dev Signed-off-by: Marc Dionne <marc.dionne@auristor.com> Link: https://lore.kernel.org/r/20250325125905.395372-1-marc.dionne@auristor.com Signed-off-by: Christian Brauner <brauner@kernel.org>