[PATCH] Bug #1829242 correction

[- - <nevilad@yahoo.com>]

Bug #1829242 correction. Added type conversions to ram_addr_t
before all left shifts of page indexes to TARGET_PAGE_BITS, to correct
overflows when the page address was 4Gb and more.

Signed-off-by: Alexey Romko <nevilad@yahoo.com>
---
 migration/ram.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index 5078f94490..90a09de620 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1730,7 +1730,7 @@ static inline bool migration_bitmap_clear_dirty(RAMState *rs,
     if (rb->clear_bmap && clear_bmap_test_and_clear(rb, page)) {
         uint8_t shift = rb->clear_bmap_shift;
         hwaddr size = 1ULL << (TARGET_PAGE_BITS + shift);
-        hwaddr start = (page << TARGET_PAGE_BITS) & (-size);
+        hwaddr start = (((ram_addr_t)page) << TARGET_PAGE_BITS) & (-size);
 
         /*
          * CLEAR_BITMAP_SHIFT_MIN should always guarantee this... this
@@ -1967,7 +1967,7 @@ static void ram_release_pages(const char *rbname, uint64_t offset, int pages)
         return;
     }
 
-    ram_discard_range(rbname, offset, pages << TARGET_PAGE_BITS);
+    ram_discard_range(rbname, offset, ((ram_addr_t)pages) << TARGET_PAGE_BITS);
 }
 
 /*
@@ -2055,7 +2055,7 @@ static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage)
     uint8_t *p;
     bool send_async = true;
     RAMBlock *block = pss->block;
-    ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
+    ram_addr_t offset = ((ram_addr_t)pss->page) << TARGET_PAGE_BITS;
     ram_addr_t current_addr = block->offset + offset;
 
     p = block->host + offset;
@@ -2242,7 +2242,7 @@ static bool find_dirty_block(RAMState *rs, PageSearchStatus *pss, bool *again)
         *again = false;
         return false;
     }
-    if ((pss->page << TARGET_PAGE_BITS) >= pss->block->used_length) {
+    if ((((ram_addr_t)pss->page) << TARGET_PAGE_BITS) >= pss->block->used_length) {
         /* Didn't find anything in this RAM Block */
         pss->page = 0;
         pss->block = QLIST_NEXT_RCU(pss->block, next);
@@ -2536,7 +2536,7 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
                                 bool last_stage)
 {
     RAMBlock *block = pss->block;
-    ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
+    ram_addr_t offset = ((ram_addr_t)pss->page) << TARGET_PAGE_BITS;
     int res;
 
     if (control_save_page(rs, block, offset, &res)) {
@@ -2617,7 +2617,7 @@ static int ram_save_host_page(RAMState *rs, PageSearchStatus *pss,
         pages += tmppages;
         pss->page++;
     } while ((pss->page & (pagesize_bits - 1)) &&
-             offset_in_ramblock(pss->block, pss->page << TARGET_PAGE_BITS));
+             offset_in_ramblock(pss->block, ((ram_addr_t)pss->page) << TARGET_PAGE_BITS));
 
     /* The offset we leave with is the last one we looked at */
     pss->page--;
@@ -2834,8 +2834,8 @@ void ram_postcopy_migrated_memory_release(MigrationState *ms)
 
         while (run_start < range) {
             unsigned long run_end = find_next_bit(bitmap, range, run_start + 1);
-            ram_discard_range(block->idstr, run_start << TARGET_PAGE_BITS,
-                              (run_end - run_start) << TARGET_PAGE_BITS);
+            ram_discard_range(block->idstr, ((ram_addr_t)run_start) << TARGET_PAGE_BITS,
+                              ((ram_addr_t)(run_end - run_start)) << TARGET_PAGE_BITS);
             run_start = find_next_zero_bit(bitmap, range, run_end + 1);
         }
     }
@@ -4201,13 +4201,13 @@ static void colo_flush_ram_cache(void)
         while (block) {
             offset = migration_bitmap_find_dirty(ram_state, block, offset);
 
-            if (offset << TARGET_PAGE_BITS >= block->used_length) {
+            if (((ram_addr_t)offset) << TARGET_PAGE_BITS >= block->used_length) {
                 offset = 0;
                 block = QLIST_NEXT_RCU(block, next);
             } else {
                 migration_bitmap_clear_dirty(ram_state, block, offset);
-                dst_host = block->host + (offset << TARGET_PAGE_BITS);
-                src_host = block->colo_cache + (offset << TARGET_PAGE_BITS);
+                dst_host = block->host + (((ram_addr_t)offset) << TARGET_PAGE_BITS);
+                src_host = block->colo_cache + (((ram_addr_t)offset) << TARGET_PAGE_BITS);
                 memcpy(dst_host, src_host, TARGET_PAGE_SIZE);
             }
         }
-- 
2.15.0.windows.1