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Fixed crash in ToArray when sequence explicitly denies __len__ #1484

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Merged
filmor merged 1 commit into from
Jul 7, 2021
Merged

Fixed crash in ToArray when sequence explicitly denies __len__ #1484

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23 changes: 16 additions & 7 deletions src/runtime/converter.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -882,17 +882,26 @@ private static bool ToArray(IntPtr value, Type obType, out object result, bool s
// See https://docs.microsoft.com/en-us/dotnet/api/system.type.makegenerictype#System_Type_MakeGenericType_System_Type
var constructedListType = typeof(List<>).MakeGenericType(elementType);
bool IsSeqObj = Runtime.PySequence_Check(value);
object[] constructorArgs = Array.Empty<object>();
if (IsSeqObj)
{
var len = Runtime.PySequence_Size(value);
list = (IList)Activator.CreateInstance(constructedListType, new Object[] { (int)len });
}
else
{
// CreateInstance can throw even if MakeGenericType succeeded.
// See https://docs.microsoft.com/en-us/dotnet/api/system.activator.createinstance#System_Activator_CreateInstance_System_Type_
list = (IList)Activator.CreateInstance(constructedListType);
if (len >= 0)
{
if (len <= int.MaxValue)
{
constructorArgs = new object[] { (int)len };
}
}
else
{
// for the sequences, that explicitly deny calling __len__()
Exceptions.Clear();
}
}
// CreateInstance can throw even if MakeGenericType succeeded.
// See https://docs.microsoft.com/en-us/dotnet/api/system.activator.createinstance#System_Activator_CreateInstance_System_Type_
list = (IList)Activator.CreateInstance(constructedListType, args: constructorArgs);
}
catch (Exception e)
{
Expand Down