Make sure to check validity of pfn Signed-off-by: Mike Kravetz Signed-off-by: Dave Hansen --- memhotplug-dave/mm/nonlinear.c | 13 ++++++++++++- 1 files changed, 12 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 2004-08-20 11:28:09.000000000 -0700 +++ memhotplug-dave/mm/nonlinear.c 2004-08-20 11:28:09.000000000 -0700 @@ -111,7 +111,18 @@ memmap_init(unsigned long num_pages, int struct page * pfn_to_page(unsigned long pfn) { - struct page *page = &mem_section[phys_section[pfn_to_section(pfn)]].mem_map[section_offset_pfn(pfn)]; + struct page *page; + + if (!mem_section[phys_section[pfn_to_section(pfn)]].mem_map) { + printk("%s()\n", __func__); + printk("pfn_to_section(%ld): %d\n", pfn, pfn_to_section(pfn)); + printk("phys_section[%d]: %d\n", pfn_to_section(pfn), + phys_section[pfn_to_section(pfn)]); + BUG(); + } + + page = &mem_section[phys_section[pfn_to_section(pfn)]].mem_map[section_offset_pfn(pfn)]; + if (!page) { printk("%s()\n", __func__); printk("pfn_to_section(%ld): %d\n", pfn, pfn_to_section(pfn)); _