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Be more rigorous about checking for invalid brother120fs filesystems --- even

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though the filesystem is so simple that positively identifying it is quite
hard.
This commit is contained in:
dg
2022-12-02 19:54:58 +00:00
parent c2b148288a
commit a33cc5710c
1 changed files with 13 additions and 2 deletions
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15
lib/vfs/brother120fs.cc
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@@ -31,7 +31,18 @@ public:
{
ByteReader br(bytes);
filename = br.read(8);
filename = filename.substr(0, filename.find(' '));
for (int i = 0; filename.size(); i++)
{
if (filename[i] == ' ')
{
filename = filename.substr(0, i);
break;
}
if ((filename[i] < 32) || (filename[i] > 126))
throw BadFilesystemException();
}
path = {filename};
brotherType = br.read_8();
@@ -91,7 +102,7 @@ public:
for (int d = 0; d < SECTOR_SIZE / 16; d++)
{
Bytes buffer = bytes.slice(d * 16, 16);
if (buffer[0] == 0xf0)
if (buffer[0] & 0x80)
continue;
auto de = std::make_shared<Brother120Dirent>(buffer);