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| author | Craig Topper <craig.topper@intel.com> | 2017-10-22 04:32:30 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@intel.com> | 2017-10-22 04:32:30 +0000 |
| commit | 158bc6474a5192bb42e8d03944ad0b689e6e2d56 (patch) | |
| tree | 9d704df28791d3885aea9168949e4b432cf94d15 /llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp | |
| parent | 53a9aff93e62b2bc54e239523df52b479d4d584e (diff) | |
| download | bcm5719-llvm-158bc6474a5192bb42e8d03944ad0b689e6e2d56.tar.gz bcm5719-llvm-158bc6474a5192bb42e8d03944ad0b689e6e2d56.zip | |
[X86] Don't allow gather/scatter to disassembler if memory operand does not use a SIB byte.
Fixes PR34998.
llvm-svn: 316282
Diffstat (limited to 'llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp index 6884f2a80de..e781c98b0bc 100644 --- a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp +++ b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp @@ -1723,6 +1723,10 @@ static int readOperands(struct InternalInstruction* insn) { if (readModRM(insn)) return -1; + // Reject if SIB wasn't used. + if (insn->eaBase != EA_BASE_sib && insn->eaBase != EA_BASE_sib64) + return -1; + // If sibIndex was set to SIB_INDEX_NONE, index offset is 4. if (insn->sibIndex == SIB_INDEX_NONE) insn->sibIndex = (SIBIndex)4; |
