fix(dds): clamp pixel memcpy to sizeof(uint32_t) to prevent stack overflow#5287
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…rflow The mask-based uncompressed decode path copies m_Bpp bytes into a uint32_t pixel variable. m_Bpp is validated up to 16 (for 128-bit DXGI formats), but the legacy fmt.masks[] are uint32_t and can only address 32 bits. A corrupt file with m_Bpp > 4 caused a stack-buffer-overflow. Clamp the copy to sizeof(pixel) = 4 bytes, which is all the masks can reference anyway. Assisted-by: Claude Code / claude-sonnet-4-6 Signed-off-by: Larry Gritz <lg@larrygritz.com>
jessey-git
approved these changes
Jul 2, 2026
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The mask-based uncompressed decode path copies m_Bpp bytes into a uint32_t pixel variable. m_Bpp is validated up to 16 (for 128-bit DXGI formats), but the legacy fmt.masks[] are uint32_t and can only address 32 bits. A corrupt file with m_Bpp > 4 caused a stack-buffer-overflow. Clamp the copy to sizeof(pixel) = 4 bytes, which is all the masks can reference anyway.
Assisted-by: Claude Code / claude-sonnet-4-6