check for integer overflow in OID::DecodeValue()

2010-06-18 00:57:26 +00:00 · 2010-06-18 00:57:26 +00:00 · 0980f65266
parent 5a9739c922
commit 0980f65266
1 changed files with 2 additions and 0 deletions
--- a/asn.cpp
+++ b/asn.cpp
@ -232,6 +232,8 @@ size_t OID::DecodeValue(BufferedTransformation &bt, word32 &v)
 		if (!bt.Get(b))
 			BERDecodeError();
 		i++;
+		if (v >> (8*sizeof(v)-7))	// v about to overflow
+			BERDecodeError();
 		v <<= 7;
 		v += b & 0x7f;
 		if (!(b & 0x80))