Fix heap-buffer-overflow read in TARGA RLE loader#39
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danoli3 merged 1 commit intodanoli3:masterfrom Apr 22, 2026
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CI failures on macOS/clang are pre-existing — the same 4 checks fail on master (e.g. run on commit a750f88). This PR builds cleanly on Linux and Windows. |
When loading a malformed TGA file whose declared image dimensions exceed the actual remaining pixel data, the IOCache buffer size computed as (remaining_size / height) can be smaller than a single pixel. The RLE decoder then calls getBytes(file_pixel_size) and reads past the end of the undersized buffer. Ensure the cache size is at least file_pixel_size bytes so that every getBytes call reads within bounds. CWE-122 (Heap-based Buffer Overflow) Found during academic security research.
JorgeBarredo14
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Summary
When loading a malformed TGA file whose declared image dimensions exceed the actual remaining pixel data, the
IOCachebuffer size computed as(remaining_size / height)can be smaller than a single pixel. The RLE decoder then callsgetBytes(file_pixel_size)and reads past the end of the undersized buffer.Root cause
PluginTARGA.cppline 596:const long sz = (remaining_size / height);— ifremaining_sizeis small relative toheight,szcan be less thanfile_pixel_size(e.g. 1 byte for a 24-bpp image that needs 3 bytes per pixel).Fix
Clamp the cache size to at least
file_pixel_sizeso that everygetBytescall reads within bounds.Metadata
_assignPixel<24>atPluginTARGA.cpp:547, called fromloadRLE<24>at line 651