LDM: Fix reassembly of extended VBLKs.

From: Ben Hutchings <[email protected]>

Extended VBLKs (those larger than the preset VBLK size) are divided
into fragments, each with its own VBLK header.  Our LDM implementation
generally assumes that each VBLK is contiguous in memory, so these
fragments must be assembled before further processing.

Currently the reassembly seems to be done quite wrongly - no VBLK
header is copied into the contiguous buffer, and the length of the
header is subtracted twice from each fragment.  Also the total
length of the reassembled VBLK is calculated incorrectly.

Signed-off-by: Ben Hutchings <[email protected]>
Signed-off-by: Anton Altaparmakov <[email protected]>

diff --git a/block/partitions/ldm.c b/block/partitions/ldm.c
index bd8ae788f689129a1ae6cc75c4687655031a868d..e507cfbd044e6b864f09baf10c192aa53689b087 100644 (file)
--- a/block/partitions/ldm.c
+++ b/block/partitions/ldm.c
@@ -2,7 +2,7 @@
  * ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
  *
  * Copyright (C) 2001,2002 Richard Russon <[email protected]>
- * Copyright (c) 2001-2007 Anton Altaparmakov
+ * Copyright (c) 2001-2012 Anton Altaparmakov
  * Copyright (C) 2001,2002 Jakob Kemi <[email protected]>
  *
  * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads 
@@ -1341,20 +1341,17 @@ found:
                ldm_error("REC value (%d) exceeds NUM value (%d)", rec, f->num);
                return false;
        }
-
        if (f->map & (1 << rec)) {
                ldm_error ("Duplicate VBLK, part %d.", rec);
                f->map &= 0x7F;                 /* Mark the group as broken */
                return false;
        }
-
        f->map |= (1 << rec);
-
+       if (!rec)
+               memcpy(f->data, data, VBLK_SIZE_HEAD);
        data += VBLK_SIZE_HEAD;
        size -= VBLK_SIZE_HEAD;
-
-       memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size);
-
+       memcpy(f->data + VBLK_SIZE_HEAD + rec * size, data, size);
        return true;
 }