Update comments

1 files changed, 9 insertions, 2 deletions

diff --git a/secblock.h b/secblock.h
index b59c431e..d7546604 100644
--- a/secblock.h
+++ b/secblock.h
@@ -527,9 +527,16 @@ private:
 		int off = reinterpret_cast<uintptr_t>(m_array) % 8;

 		byte* ptr = reinterpret_cast<byte*>(m_array) + off;

 

-		// Verify the 16-byte alignment

+		// Verify the 16-byte alignment. This is the point

+		// of these extra gyrations.

 		CRYPTOPP_ASSERT(IsAlignedOn(ptr, 16));

-		// Verify allocated array with pad is large enough.

+		// Verify the lower bound. This is Issue 982/988.

+		CRYPTOPP_ASSERT(

+			reinterpret_cast<uintptr_t>(ptr >=

+			  reinterpret_cast<uintptr_t>(m_array)

+		);

+		// Verify the upper bound. Allocated array with

+		// pad is large enough.

 		CRYPTOPP_ASSERT(

 			reinterpret_cast<uintptr_t>(ptr+S*sizeof(T)) <=

 			  reinterpret_cast<uintptr_t>(m_array+(S+PAD))