Merge pull request #5639

2eef90d6 rpc: restrict the recent cutoff size in restricted RPC mode (moneromooo-monero)
0564da5f ensure no NULL is passed to memcpy (moneromooo-monero)
bc09766b abstract_tcp_server2: improve DoS resistance (moneromooo-monero)
1387549e serialization: check stream good flag at the end (moneromooo-monero)
a00cabd4 tree-hash: allocate variable memory on heap, not stack (moneromooo-monero)
f2152192 cryptonote: throw on tx hash calculation error (moneromooo-monero)
db2b9fba serialization: fail on read_varint error (moneromooo-monero)
68ad5481 cryptonote_protocol: fix another potential P2P DoS (moneromooo-monero)
1cc61018 cryptonote_protocol: expand basic DoS protection (moneromooo-monero)
8f66b705 cryptonote_protocol_handler: prevent potential DoS (anonimal)
39169ace epee: basic sanity check on allocation size from untrusted source (moneromooo-monero)

1 files changed, 2 insertions, 1 deletions

diff --git a/contrib/epee/src/buffer.cpp b/contrib/epee/src/buffer.cpp
index d637b905e..10ea6de56 100644
--- a/contrib/epee/src/buffer.cpp
+++ b/contrib/epee/src/buffer.cpp
@@ -64,7 +64,8 @@ void buffer::append(const void *data, size_t sz)
       size_t reserve = (((size() + sz) * 3 / 2) + 4095) & ~4095;
       new_storage.reserve(reserve);
       new_storage.resize(size());
-      memcpy(new_storage.data(), storage.data() + offset, storage.size() - offset);
+      if (size() > 0)
+        memcpy(new_storage.data(), storage.data() + offset, storage.size() - offset);
       offset = 0;
       std::swap(storage, new_storage);
     }