flewkey/cuberite-2a
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Fixed stupid buffer overflow in array setblocks

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This commit is contained in:
Tycho 2014-05-10 17:46:49 +01:00
parent ba25f6b524
commit 0adb5c94b8
3 changed files with 13 additions and 13 deletions
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6
src/ChunkBuffer.cpp
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@ -35,7 +35,7 @@ void cChunkBuffer::CopyBlocks (BLOCKTYPE * a_dest, size_t a_Idx, size_t length
memcpy(
&a_dest[i * segment_length],
&m_Sections[i]->m_BlockTypes,
sizeof(BLOCKTYPE) * length
sizeof(BLOCKTYPE) * tocopy
);
}
else
@ -43,7 +43,7 @@ void cChunkBuffer::CopyBlocks (BLOCKTYPE * a_dest, size_t a_Idx, size_t length
memset(
&a_dest[i * segment_length],
0,
sizeof(BLOCKTYPE) * length
sizeof(BLOCKTYPE) * tocopy
);
}
}
@ -141,7 +141,7 @@ void cChunkBuffer::SetBlocks(const BLOCKTYPE * a_src)
{
for (size_t i = 0; i < CHUNK_SECTION_NUM; i++)
{
const size_t segment_length = CHUNK_SECTION_HEIGHT * 16 * 16 / 2;
const size_t segment_length = CHUNK_SECTION_HEIGHT * 16 * 16;
if (m_Sections[i])
{
memcpy(&m_Sections[i]->m_BlockTypes, &a_src[i * segment_length], sizeof(BLOCKTYPE) * segment_length);

4
src/ChunkBuffer.h
View File

@ -124,7 +124,7 @@ public:
m_Sections[Section] = Allocate();
if(!m_Sections[Section])
{
ASSERT("Failed to allocate a new section in Chunkbuffer");
ASSERT(!"Failed to allocate a new section in Chunkbuffer");
return;
}
}
@ -169,7 +169,7 @@ public:
m_Sections[Section] = Allocate();
if(!m_Sections[Section])
{
ASSERT("Failed to allocate a new section in Chunkbuffer");
ASSERT(!"Failed to allocate a new section in Chunkbuffer");
return;
}
}

16
tests/ChunkBuffer/Copies.cpp
View File

@ -15,8 +15,8 @@ int main(int argc, char** argv)
testassert(copy.GetBlock(3,1,4) == 0xDE);
testassert(copy.GetMeta(3,1,4) == 0xA);
BLOCKTYPE * SrcBlockBuffer = new BLOCKTYPE[256 * 256 * 256];
for (int i = 0; i < 256* 256 * 256; i += 4)
BLOCKTYPE * SrcBlockBuffer = new BLOCKTYPE[16 * 16 * 256];
for (int i = 0; i < 16 * 16 * 256; i += 4)
{
SrcBlockBuffer[i+0] = 0xDE;
SrcBlockBuffer[i+1] = 0xAD;
@ -25,16 +25,16 @@ int main(int argc, char** argv)
}
buffer.SetBlocks(SrcBlockBuffer);
BLOCKTYPE * DstBlockBuffer = new BLOCKTYPE[256 * 256 * 256];
BLOCKTYPE * DstBlockBuffer = new BLOCKTYPE[16 * 16 * 256];
buffer.CopyBlocks(DstBlockBuffer);
testassert(memcmp(SrcBlockBuffer, DstBlockBuffer, (256 * 256 * 256) -1) == 0);
testassert(memcmp(SrcBlockBuffer, DstBlockBuffer, (16 * 16 * 256) -1) == 0);
delete SrcBlockBuffer;
delete DstBlockBuffer;
SrcBlockBuffer = NULL;
DstBlockBuffer = NULL;
NIBBLETYPE * SrcNibbleBuffer = new NIBBLETYPE[256 * 256 * 256/2];
for (int i = 0; i < 256* 256 * 256 / 2; i += 4)
NIBBLETYPE * SrcNibbleBuffer = new NIBBLETYPE[16 * 16 * 256/2];
for (int i = 0; i < 16 * 16 * 256 / 2; i += 4)
{
SrcNibbleBuffer[i+0] = 0xEF;
SrcNibbleBuffer[i+1] = 0xDE;
@ -43,9 +43,9 @@ int main(int argc, char** argv)
}
buffer.SetMeta(SrcNibbleBuffer);
NIBBLETYPE * DstNibbleBuffer = new NIBBLETYPE[256 * 256 * 256/ 2];
NIBBLETYPE * DstNibbleBuffer = new NIBBLETYPE[16 * 16 * 256/ 2];
buffer.CopyMeta(DstNibbleBuffer);
testassert(memcmp(SrcNibbleBuffer, DstNibbleBuffer, (256 * 256 * 256 /2) -1) == 0);
testassert(memcmp(SrcNibbleBuffer, DstNibbleBuffer, (16 * 16 * 256 /2) -1) == 0);
delete SrcNibbleBuffer;
delete DstNibbleBuffer;
SrcNibbleBuffer = NULL;