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-rw-r--r--dom/crypto/WebCryptoTask.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/dom/crypto/WebCryptoTask.cpp b/dom/crypto/WebCryptoTask.cpp
index 57a7da186..f5fc7b5bc 100644
--- a/dom/crypto/WebCryptoTask.cpp
+++ b/dom/crypto/WebCryptoTask.cpp
@@ -716,6 +716,11 @@ private:
return NS_ERROR_DOM_INVALID_ACCESS_ERR;
}
+ // Check whether the integer addition would overflow.
+ if (std::numeric_limits<CryptoBuffer::size_type>::max() - 16 < mData.Length()) {
+ return NS_ERROR_DOM_DATA_ERR;
+ }
+
// Initialize the output buffer (enough space for padding / a full tag)
uint32_t dataLen = mData.Length();
uint32_t maxLen = dataLen + 16;