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M_LZMA with hi parameter bytes confused --ultra-brute

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https://github.com/upx/upx/issues/900
	modified:   packhead.cpp
	modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser
2025-03-20 09:48:00 -07:00
parent ff75a462a4
commit a25c20ee0b
2 changed files with 10 additions and 7 deletions
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src/packhead.cpp
+4 -1
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@@ -47,7 +47,10 @@ void PackHeader::reset() noexcept {
int PackHeader::set_method(int m, unsigned offset) {
unsigned mc = ~(0x80u << 24) & m; // see ph_forced_method
if ((mc < M_NRV2B_LE32 || M_LZMA < mc) && ~0u != offset)
unsigned lo = 0xFF & m;
// See packer_c.cpp for "hi bytes" in M_LZMA_003 and M_LZMA_407.
// "hi bytes" are not allowed unless M_LZMA.
if ((lo < M_NRV2B_LE32 || M_LZMA < lo || (M_LZMA != lo && mc != lo)) && ~0u != offset)
throwCantPack("bad method %#x at %#x", (unsigned) m, offset);
return method = m;
}