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make llvm-dwarfdump a little more resilient when parsing .debug_loc

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sections. The call to data.getUnsigned(&Offset, AddressSize) only
increments Offset if the read succeeds, which will result in an infinite
loop.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201179 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl 2014-02-11 21:22:53 +00:00
parent 69bc4ddf10
commit d5468bf381
1 changed files with 3 additions and 1 deletions
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4
lib/DebugInfo/DWARFDebugLoc.cpp
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@ -36,7 +36,7 @@ void DWARFDebugLoc::dump(raw_ostream &OS) const {
void DWARFDebugLoc::parse(DataExtractor data, unsigned AddressSize) { void DWARFDebugLoc::parse(DataExtractor data, unsigned AddressSize) {
uint32_t Offset = 0; uint32_t Offset = 0;
while (data.isValidOffset(Offset)) { while (data.isValidOffset(Offset+AddressSize-1)) {
Locations.resize(Locations.size() + 1); Locations.resize(Locations.size() + 1);
LocationList &Loc = Locations.back(); LocationList &Loc = Locations.back();
Loc.Offset = Offset; Loc.Offset = Offset;
@ -71,4 +71,6 @@ void DWARFDebugLoc::parse(DataExtractor data, unsigned AddressSize) {
Loc.Entries.push_back(llvm_move(E)); Loc.Entries.push_back(llvm_move(E));
} }
} }
if (data.isValidOffset(Offset))
llvm::errs() << "error: failed to consume entire .debug_loc section\n";
} }