Make sure to check validity of pfn Signed-off-by: Mike Kravetz Signed-off-by: Dave Hansen --- memhotplug-dave/mm/nonlinear.c | 6 +++++- 1 files changed, 5 insertions(+), 1 deletion(-) diff -puN mm/nonlinear.c~C5-nonlinear-fix-pfn_to_page mm/nonlinear.c --- memhotplug/mm/nonlinear.c~C5-nonlinear-fix-pfn_to_page 2004-10-08 00:14:52.000000000 -0700 +++ memhotplug-dave/mm/nonlinear.c 2004-10-08 00:14:52.000000000 -0700 @@ -111,7 +111,11 @@ memmap_init(unsigned long num_pages, int struct page * pfn_to_page(unsigned long pfn) { - return &mem_section[phys_section[pfn_to_section(pfn)]].mem_map[section_offset_pfn(pfn)]; + struct page *page; + + BUG_ON(!mem_section[phys_section[pfn_to_section(pfn)]].mem_map); + page = &mem_section[phys_section[pfn_to_section(pfn)]].mem_map[section_offset_pfn(pfn)]; + return page; } unsigned long _