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[CodeView] Take the StreamRef::readBytes offset into account when validating 

We only considered the length of the operation and the length of the
StreamRef without considered what it meant for the offset to be at a
non-zero position.

llvm-svn: 271496
This commit is contained in:
David Majnemer 2016-06-02 06:21:44 +00:00
parent afefa67310
commit 8c79db1741
2 changed files with 3 additions and 1 deletions
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2
llvm/include/llvm/DebugInfo/CodeView/StreamRef.h
View File

@ -29,7 +29,7 @@ public:
Error readBytes(uint32_t Offset, uint32_t Size,
ArrayRef<uint8_t> &Buffer) const override {
if (Size > Length)
if (Size + Offset > Length)
return make_error<CodeViewError>(cv_error_code::insufficient_buffer);
return Stream->readBytes(ViewOffset + Offset, Size, Buffer);
}

2
llvm/unittests/DebugInfo/PDB/MappedBlockStreamTest.cpp
View File

@ -79,6 +79,8 @@ TEST(MappedBlockStreamTest, ReadBeyondEndOfStreamRef) {
EXPECT_NO_ERROR(R.readStreamRef(SR, 0U));
ArrayRef<uint8_t> Buffer;
EXPECT_ERROR(SR.readBytes(0U, 1U, Buffer));
EXPECT_NO_ERROR(R.readStreamRef(SR, 1U));
EXPECT_ERROR(SR.readBytes(1U, 1U, Buffer));
}
// Tests that a read which outputs into a full destination buffer works and