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Make AuthenticatedSymmetricCipherBase::ProcessData overflow safe

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This commit is contained in:
Jeffrey Walton 2019-01-30 10:45:12 -05:00
parent 97838012ee
commit df98f8c16b
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GPG Key ID: B36AB348921B1838
1 changed files with 3 additions and 2 deletions
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authenc.cpp
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@ -79,6 +79,7 @@ void AuthenticatedSymmetricCipherBase::Resynchronize(const byte *iv, int length)
void AuthenticatedSymmetricCipherBase::Update(const byte *input, size_t length)
{
// Part of original authenc.cpp code. Don't remove it.
if (length == 0) {return;}
switch (m_state)
@ -107,9 +108,9 @@ void AuthenticatedSymmetricCipherBase::Update(const byte *input, size_t length)
void AuthenticatedSymmetricCipherBase::ProcessData(byte *outString, const byte *inString, size_t length)
{
m_totalMessageLength += length;
if (m_state >= State_IVSet && m_totalMessageLength > MaxMessageLength())
if (m_state >= State_IVSet && length > MaxMessageLength()-m_totalMessageLength)
throw InvalidArgument(AlgorithmName() + ": message length exceeds maximum");
m_totalMessageLength += length;
reswitch:
switch (m_state)