Patchwork [v4,03/10] vmdk: use unsigned values for on disk header fields

login
register
mail settings
Submitter Fam Zheng
Date Aug. 6, 2013, 7:44 a.m.
Message ID <1375775095-19456-4-git-send-email-famz@redhat.com>
Download mbox | patch
Permalink /patch/264892/
State New
Headers show

Comments

Fam Zheng - Aug. 6, 2013, 7:44 a.m.
The size and offset fields are all non-negative values, use uint64_t for
them to avoid getting negative in memory value by int overflow.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/vmdk.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

Patch

diff --git a/block/vmdk.c b/block/vmdk.c
index 8b86fe9..5d11a43 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -67,14 +67,14 @@  typedef struct {
 typedef struct {
     uint32_t version;
     uint32_t flags;
-    int64_t capacity;
-    int64_t granularity;
-    int64_t desc_offset;
-    int64_t desc_size;
-    int32_t num_gtes_per_gte;
-    int64_t rgd_offset;
-    int64_t gd_offset;
-    int64_t grain_offset;
+    uint64_t capacity;
+    uint64_t granularity;
+    uint64_t desc_offset;
+    uint64_t desc_size;
+    uint32_t num_gtes_per_gte;
+    uint64_t rgd_offset;
+    uint64_t gd_offset;
+    uint64_t grain_offset;
     char filler[1];
     char check_bytes[4];
     uint16_t compressAlgorithm;
@@ -109,7 +109,7 @@  typedef struct VmdkExtent {
 
 typedef struct BDRVVmdkState {
     CoMutex lock;
-    int desc_offset;
+    uint64_t desc_offset;
     bool cid_updated;
     uint32_t parent_cid;
     int num_extents;
@@ -490,7 +490,7 @@  static int vmdk_open_vmdk3(BlockDriverState *bs,
 }
 
 static int vmdk_open_desc_file(BlockDriverState *bs, int flags,
-                               int64_t desc_offset);
+                               uint64_t desc_offset);
 
 static int vmdk_open_vmdk4(BlockDriverState *bs,
                            BlockDriverState *file,
@@ -508,7 +508,7 @@  static int vmdk_open_vmdk4(BlockDriverState *bs,
         return ret;
     }
     if (header.capacity == 0) {
-        int64_t desc_offset = le64_to_cpu(header.desc_offset);
+        uint64_t desc_offset = le64_to_cpu(header.desc_offset);
         if (desc_offset) {
             return vmdk_open_desc_file(bs, flags, desc_offset << 9);
         }
@@ -728,7 +728,7 @@  next_line:
 }
 
 static int vmdk_open_desc_file(BlockDriverState *bs, int flags,
-                               int64_t desc_offset)
+                               uint64_t desc_offset)
 {
     int ret;
     char *buf = NULL;