1 files changed, 25 insertions, 7 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 508bec1cee27..3cf6681ac80d 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -421,7 +421,7 @@ static u64 __init e820_update_range_map(struct e820map *e820x, u64 start,
                                         u64 size, unsigned old_type,
                                         unsigned new_type)
 {
-        int i;
+        unsigned int i, x;
         u64 real_updated_size = 0;
 
         BUG_ON(old_type == new_type);
@@ -429,7 +429,7 @@ static u64 __init e820_update_range_map(struct e820map *e820x, u64 start,
         if (size > (ULLONG_MAX - start))
                 size = ULLONG_MAX - start;
 
-        for (i = 0; i < e820.nr_map; i++) {
+        for (i = 0; i < e820x->nr_map; i++) {
                 struct e820entry *ei = &e820x->map[i];
                 u64 final_start, final_end;
                 if (ei->type != old_type)
@@ -446,14 +446,23 @@ static u64 __init e820_update_range_map(struct e820map *e820x, u64 start,
                 final_end = min(start + size, ei->addr + ei->size);
                 if (final_start >= final_end)
                         continue;
-                e820_add_region(final_start, final_end - final_start,
-                                         new_type);
+
+                x = e820x->nr_map;
+                if (x == ARRAY_SIZE(e820x->map)) {
+                        printk(KERN_ERR "Too many memory map entries!\n");
+                        break;
+                }
+                e820x->map[x].addr = final_start;
+                e820x->map[x].size = final_end - final_start;
+                e820x->map[x].type = new_type;
+                e820x->nr_map++;
+
                 real_updated_size += final_end - final_start;
 
-                ei->size -= final_end - final_start;
                 if (ei->addr < final_start)
                         continue;
                 ei->addr = final_end;
+                ei->size -= final_end - final_start;
         }
         return real_updated_size;
 }
@@ -1020,8 +1029,8 @@ u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align)
                         continue;
                 return addr;
         }
-        return -1UL;
 
+        return -1ULL;
 }
 
 /*
@@ -1034,13 +1043,22 @@ u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align)
         u64 start;
 
         start = startt;
-        while (size < sizet)
+        while (size < sizet && (start + 1))
                 start = find_e820_area_size(start, &size, align);
 
         if (size < sizet)
                 return 0;
 
+#ifdef CONFIG_X86_32
+        if (start >= MAXMEM)
+                return 0;
+        if (start + size > MAXMEM)
+                size = MAXMEM - start;
+#endif
+
         addr = round_down(start + size - sizet, align);
+        if (addr < start)
+                return 0;
         e820_update_range(addr, sizet, E820_RAM, E820_RESERVED);
         e820_update_range_saved(addr, sizet, E820_RAM, E820_RESERVED);
         printk(KERN_INFO "update e820 for early_reserve_e820\n");