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[llvm-objdump] Don't disassemble symbols before SectionAddr 

This was caught by UBSAN

tools/llvm-objdump/X86/macho-disassembly-g-dsym.test
tools/llvm-objdump/X86/hex-displacement.test

llvm-svn: 358806
This commit is contained in:
Fangrui Song 2019-04-20 07:19:24 +00:00
parent 4d4b5d952e
commit ce12ea8dfc
1 changed files with 6 additions and 4 deletions
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10
llvm/tools/llvm-objdump/llvm-objdump.cpp
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@ -1148,13 +1148,15 @@ static void disassembleObject(const Target *TheTarget, const ObjectFile *Obj,
continue;
uint64_t Start = std::get<0>(Symbols[SI]);
if (Start < SectionAddr || StopAddress <= Start)
continue;
// The end is the section end, the beginning of the next symbol, or
// --stop-address.
uint64_t End = std::min<uint64_t>(SectionAddr + SectSize, StopAddress);
if (SI + 1 < SE)
End = std::min(End, std::get<0>(Symbols[SI + 1]));
if (Start >= End || Start >= StopAddress || End <= StartAddress)
uint64_t End = std::min<uint64_t>(
SI + 1 < SE ? std::get<0>(Symbols[SI + 1]) : SectionAddr + SectSize,
StopAddress);
if (Start >= End || End <= StartAddress)
continue;
Start -= SectionAddr;
End -= SectionAddr;