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Fix TGA's with bad palette colors reading from behind palette memory

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TGA's can claim to use less palette colors than they later do.
We only support 8-bit palettes, so to make this safer lets just always allocate at least 256 bytes.
Thanks @erlehmann for report and testcase: https://irrlicht.sourceforge.io/forum/viewtopic.php?p=307191
Based on Minetest bug report: https://github.com/minetest/irrlicht/issues/236

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6532 dfc29bdd-3216-0410-991c-e03cc46cb475
This commit is contained in:
cutealien 2023-09-23 16:34:42 +00:00 committed by sfan5
parent c01de80583
commit 05ebc43222
1 changed files with 11 additions and 2 deletions
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13
source/Irrlicht/CImageLoaderTGA.cpp
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@ -116,8 +116,17 @@ IImage* CImageLoaderTGA::loadImage(io::IReadFile* file) const
if (header.ColorMapType)
{
// create 32 bit palette
palette = new u32[ header.ColorMapLength];
// Create 32 bit palette
const irr::u16 paletteSize = core::max_((u16)256, header.ColorMapLength); // ColorMapLength can lie, but so far we only use palette for 8-bit, so ensure it has 256 entries
palette = new u32[paletteSize];
if( paletteSize > header.ColorMapLength )
{
// To catch images using palette colors with invalid indices
const irr::u32 errorCol = irr::video::SColor(255,255, 0, 205).color; // bright magenta
for ( irr::u16 i = header.ColorMapLength; i< paletteSize; ++i )
palette[i] = errorCol;
}
// read color map
u8 * colorMap = new u8[header.ColorMapEntrySize/8 * header.ColorMapLength];