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Make sure data is available before dereferencing it

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llvm-svn: 271032
This commit is contained in:
David Majnemer 2016-05-27 18:50:02 +00:00
parent fe2aab20df
commit 517cb96201
1 changed files with 14 additions and 0 deletions
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14
lib/DebugInfo/CodeView/RecordSerialization.cpp
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@ -45,6 +45,8 @@ std::error_code llvm::codeview::consume(ArrayRef<uint8_t> &Data, APSInt &Num) {
}
switch (Short) {
case LF_CHAR:
if (Data.size() < 1)
return std::make_error_code(std::errc::illegal_byte_sequence);
Num = APSInt(APInt(/*numBits=*/8,
*reinterpret_cast<const int8_t *>(Data.data()),
/*isSigned=*/true),
@ -52,6 +54,8 @@ std::error_code llvm::codeview::consume(ArrayRef<uint8_t> &Data, APSInt &Num) {
Data = Data.drop_front(1);
return std::error_code();
case LF_SHORT:
if (Data.size() < 2)
return std::make_error_code(std::errc::illegal_byte_sequence);
Num = APSInt(APInt(/*numBits=*/16,
*reinterpret_cast<const little16_t *>(Data.data()),
/*isSigned=*/true),
@ -59,6 +63,8 @@ std::error_code llvm::codeview::consume(ArrayRef<uint8_t> &Data, APSInt &Num) {
Data = Data.drop_front(2);
return std::error_code();
case LF_USHORT:
if (Data.size() < 2)
return std::make_error_code(std::errc::illegal_byte_sequence);
Num = APSInt(APInt(/*numBits=*/16,
*reinterpret_cast<const ulittle16_t *>(Data.data()),
/*isSigned=*/false),
@ -66,6 +72,8 @@ std::error_code llvm::codeview::consume(ArrayRef<uint8_t> &Data, APSInt &Num) {
Data = Data.drop_front(2);
return std::error_code();
case LF_LONG:
if (Data.size() < 4)
return std::make_error_code(std::errc::illegal_byte_sequence);
Num = APSInt(APInt(/*numBits=*/32,
*reinterpret_cast<const little32_t *>(Data.data()),
/*isSigned=*/true),
@ -73,6 +81,8 @@ std::error_code llvm::codeview::consume(ArrayRef<uint8_t> &Data, APSInt &Num) {
Data = Data.drop_front(4);
return std::error_code();
case LF_ULONG:
if (Data.size() < 4)
return std::make_error_code(std::errc::illegal_byte_sequence);
Num = APSInt(APInt(/*numBits=*/32,
*reinterpret_cast<const ulittle32_t *>(Data.data()),
/*isSigned=*/FalseVal),
@ -80,6 +90,8 @@ std::error_code llvm::codeview::consume(ArrayRef<uint8_t> &Data, APSInt &Num) {
Data = Data.drop_front(4);
return std::error_code();
case LF_QUADWORD:
if (Data.size() < 8)
return std::make_error_code(std::errc::illegal_byte_sequence);
Num = APSInt(APInt(/*numBits=*/64,
*reinterpret_cast<const little64_t *>(Data.data()),
/*isSigned=*/true),
@ -87,6 +99,8 @@ std::error_code llvm::codeview::consume(ArrayRef<uint8_t> &Data, APSInt &Num) {
Data = Data.drop_front(8);
return std::error_code();
case LF_UQUADWORD:
if (Data.size() < 8)
return std::make_error_code(std::errc::illegal_byte_sequence);
Num = APSInt(APInt(/*numBits=*/64,
*reinterpret_cast<const ulittle64_t *>(Data.data()),
/*isSigned=*/false),