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

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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271496 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer 2016-06-02 06:21:44 +00:00
parent f117b3a80f
commit 81d9dfc70d
2 changed files with 3 additions and 1 deletions
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2
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
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