0003-x265-sei-overflow.patch

diff --git a/source/encoder/encoder.cpp b/source/encoder/encoder.cpp
index 4513f4f..80e205f 100644
--- a/source/encoder/encoder.cpp
+++ b/source/encoder/encoder.cpp
@@ -1106,6 +1106,8 @@ void Encoder::copyUserSEIMessages(Frame *frame, const x265_picture* pic_in)
 
             if (!frame->m_userSEI.payloads[i].payload)
                 frame->m_userSEI.payloads[i].payload = new uint8_t[input.payloadSize];
+            else if (frame->m_userSEI.payloads[i].payloadSize < input.payloadSize)
+                frame->m_userSEI.payloads[i].payload = (uint8_t *)realloc(frame->m_userSEI.payloads[i].payload, input.payloadSize);
             memcpy(frame->m_userSEI.payloads[i].payload, input.payload, input.payloadSize);
             frame->m_userSEI.payloads[i].payloadSize = input.payloadSize;
             frame->m_userSEI.payloads[i].payloadType = input.payloadType;