[ARM] 5402/1: fix a case of wrap-around in sanity_check_meminfo()

In the non highmem case, if two memory banks of 1GB each are provided, the second bank would evade suppression since its virtual base would be 0. Fix this by disallowing any memory bank which virtual base address is found to be lower than PAGE_OFFSET. Reported-by: Lennert Buytenhek <[email protected]> Signed-off-by: Nicolas Pitre <[email protected]> Signed-off-by: Russell King <[email protected]>
ferruhy · Feb 19, 2009 · 3fd9825 · 3fd9825
1 parent fd4b9b3
commit 3fd9825
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
@@ -693,7 +693,8 @@ static void __init sanity_check_meminfo(void)
 		 * Check whether this memory bank would entirely overlap
 		 * the vmalloc area.
 		 */
-		if (__va(bank->start) >= VMALLOC_MIN) {
+		if (__va(bank->start) >= VMALLOC_MIN ||
+		    __va(bank->start) < PAGE_OFFSET) {
 			printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx "
 			       "(vmalloc region overlap).\n",
 			       bank->start, bank->start + bank->size - 1);