Impact
in the following code, the return of <iface>.returns_int128() is not validated to fall within the bounds of int128. as of v0.3.0, <iface>.returns_int128() is validated in simple expressions, but not complex expressions.
interface iface:
def returns_int128() -> int128: view
def returns_Bytes33() -> Bytes[33]: view
x: iface
@external
def call_out():
x: int128 = self.x.returns_int128() # affected, <0.3.0
y: uint256 = convert(self.x.returns_int128(), uint256) # affected, <0.3.2
z: Bytes[33] = concat(self.x.returns_Bytes33(), b"") # affected >= 0.3.0, <0.3.2Patches
0.3.2 (as of vyperlang/vyper@049dbdc)
Workarounds
Break up operations involving external calls into multiple statements. For instance, instead of the example above, use
x: int128 = self.x.returns_int128()
y: uint256 = convert(x, uint256)
References
Impact
in the following code, the return of
<iface>.returns_int128()is not validated to fall within the bounds ofint128. as of v0.3.0,<iface>.returns_int128()is validated in simple expressions, but not complex expressions.Patches
0.3.2 (as of vyperlang/vyper@049dbdc)
Workarounds
Break up operations involving external calls into multiple statements. For instance, instead of the example above, use
References