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Added length checks for ISO9660 root directory.

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This commit is contained in:
Natalia Portillo
2017-10-09 09:21:30 +01:00
parent 81313fa166
commit 1698f3264a
1 changed files with 21 additions and 3 deletions
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24
DiscImageChef.Filesystems/ISO9660/Info.cs
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@@ -236,14 +236,27 @@ namespace DiscImageChef.Filesystems.ISO9660
decodedJolietVD = DecodeJolietDescriptor(jolietvd.Value);
uint rootLocation = HighSierra ? hsvd.Value.root_directory_record.extent : pvd.Value.root_directory_record.extent;
uint rootSize = HighSierra ? hsvd.Value.root_directory_record.size / hsvd.Value.logical_block_size : pvd.Value.root_directory_record.size / pvd.Value.logical_block_size;
uint rootSize = 0;
if(HighSierra)
{
rootSize = hsvd.Value.root_directory_record.size / hsvd.Value.logical_block_size;
if(hsvd.Value.root_directory_record.size % hsvd.Value.logical_block_size > 0)
rootSize++;
}
else
{
rootSize = pvd.Value.root_directory_record.size / pvd.Value.logical_block_size;
if(pvd.Value.root_directory_record.size % pvd.Value.logical_block_size > 0)
rootSize++;
}
byte[] root_dir = imagePlugin.ReadSectors(rootLocation + partition.Start, rootSize);
int rootOff = 0;
bool XA = false;
// Walk thru root directory to see system area extensions in use
while(rootOff < root_dir.Length)
while(rootOff + Marshal.SizeOf(typeof(DirectoryRecord)) < root_dir.Length)
{
DirectoryRecord record = new DirectoryRecord();
IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(record));
@@ -252,18 +265,23 @@ namespace DiscImageChef.Filesystems.ISO9660
Marshal.FreeHGlobal(ptr);
int sa_off = Marshal.SizeOf(record) + record.name_len;
sa_off += sa_off % 2;
int sa_len = record.length - sa_off;
if(sa_len > 0 && rootOff + sa_off + sa_len <= root_dir.Length)
{
byte[] sa = new byte[sa_len];
Array.Copy(root_dir, rootOff + sa_off, sa, 0, sa_len);
sa_off = 0;
if(sa_len >= Marshal.SizeOf(typeof(CdromXa)))
if(Marshal.SizeOf(typeof(CdromXa)) + sa_off <= sa_len)
{
CdromXa xa = BigEndianMarshal.ByteArrayToStructureBigEndian<CdromXa>(sa);
if(xa.signature == XaMagic)
{
XA = true;
sa_off += Marshal.SizeOf(typeof(CdromXa));
}
}
}