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[PATCH 01/10] hbitmap: introduce HBITMAP_MAX_ORIG_SIZE
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH 01/10] hbitmap: introduce HBITMAP_MAX_ORIG_SIZE |
Date: |
Mon, 30 Sep 2019 18:14:53 +0300 |
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
include/qemu/hbitmap.h | 7 +++++++
util/hbitmap.c | 2 ++
2 files changed, 9 insertions(+)
diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h
index 1bf944ca3d..82317c5364 100644
--- a/include/qemu/hbitmap.h
+++ b/include/qemu/hbitmap.h
@@ -33,6 +33,13 @@ typedef struct HBitmapIter HBitmapIter;
*/
#define HBITMAP_LEVELS ((HBITMAP_LOG_MAX_SIZE / BITS_PER_LEVEL) + 1)
+/*
+ * We have APIs which returns signed int64_t, to be able to return error.
+ * Therefore we can't handle bitmaps with absolute size larger than
+ * (INT64_MAX+1). Still, keep it INT64_MAX to be a bit safer.
+ */
+#define HBITMAP_MAX_ORIG_SIZE INT64_MAX
+
struct HBitmapIter {
const HBitmap *hb;
diff --git a/util/hbitmap.c b/util/hbitmap.c
index 757d39e360..df192234e3 100644
--- a/util/hbitmap.c
+++ b/util/hbitmap.c
@@ -708,6 +708,7 @@ HBitmap *hbitmap_alloc(uint64_t size, int granularity)
HBitmap *hb = g_new0(struct HBitmap, 1);
unsigned i;
+ assert(size <= HBITMAP_MAX_ORIG_SIZE);
hb->orig_size = size;
assert(granularity >= 0 && granularity < 64);
@@ -738,6 +739,7 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size)
uint64_t num_elements = size;
uint64_t old;
+ assert(size <= HBITMAP_MAX_ORIG_SIZE);
hb->orig_size = size;
/* Size comes in as logical elements, adjust for granularity. */
--
2.21.0
- [PATCH 00/10] Further bitmaps improvements, Vladimir Sementsov-Ogievskiy, 2019/09/30
- [PATCH 02/10] hbitmap: move hbitmap_iter_next_word to hbitmap.c, Vladimir Sementsov-Ogievskiy, 2019/09/30
- [PATCH 03/10] hbitmap: unpublish hbitmap_iter_skip_words, Vladimir Sementsov-Ogievskiy, 2019/09/30
- [PATCH 09/10] nbd/server: use bdrv_dirty_bitmap_next_dirty_area, Vladimir Sementsov-Ogievskiy, 2019/09/30
- [PATCH 10/10] block/qcow2-bitmap: use bdrv_dirty_bitmap_next_dirty, Vladimir Sementsov-Ogievskiy, 2019/09/30
- [PATCH 01/10] hbitmap: introduce HBITMAP_MAX_ORIG_SIZE,
Vladimir Sementsov-Ogievskiy <=
- [PATCH 04/10] hbitmap: drop meta bitmaps as they are unused, Vladimir Sementsov-Ogievskiy, 2019/09/30
- [PATCH 07/10] block/dirty-bitmap: improve _next_dirty_area API, Vladimir Sementsov-Ogievskiy, 2019/09/30
- [PATCH 08/10] nbd/server: introduce NBDExtentArray, Vladimir Sementsov-Ogievskiy, 2019/09/30
- [PATCH 05/10] block/dirty-bitmap: switch _next_dirty_area and _next_zero to int64_t, Vladimir Sementsov-Ogievskiy, 2019/09/30
- [PATCH 06/10] block/dirty-bitmap: add _next_dirty API, Vladimir Sementsov-Ogievskiy, 2019/09/30