wolfbeast b67e03dc90 Check for integer overflow in AesTask::DoCrypto() (DiD) ...

After calling mResult.SetLength(mData.Length() + 16) we should check
that the integer addition didn't overflow. It seems at the moment
impossible to create ArrayBuffers of size >= 0x0xfffffff0, however
adding a check here doesn't hurt.

mResult.Length() is passed to the PK11 API functions as a
maxOut parameter and should be checked by the
softoken crypto algorithm implementations.
AES-ECB and AES-GCM seem to do that correctly.

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..

test

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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CryptoBuffer.cpp

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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CryptoBuffer.h

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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CryptoKey.cpp

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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CryptoKey.h

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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KeyAlgorithmProxy.cpp

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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KeyAlgorithmProxy.h

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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moz.build

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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WebCryptoCommon.h

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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WebCryptoTask.cpp

Check for integer overflow in AesTask::DoCrypto() (DiD)

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WebCryptoTask.h

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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WebCryptoThreadPool.cpp

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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WebCryptoThreadPool.h

import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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