From a8de467ef8bb12a4a625b937f487f780c426d958 Mon Sep 17 00:00:00 2001
From: "mergify[bot]" <37929162+mergify[bot]@users.noreply.github.com>
Date: Thu, 6 Aug 2020 16:24:14 +0000
Subject: [PATCH] Realloc not supported (#11418)

(cherry picked from commit bc4c5c5a975f546f1af07e746054ed1d7aa5787e)

Co-authored-by: Jack May <jack@solana.com>
---
 programs/bpf_loader/src/syscalls.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/programs/bpf_loader/src/syscalls.rs b/programs/bpf_loader/src/syscalls.rs
index 6483c523a5..954b712892 100644
--- a/programs/bpf_loader/src/syscalls.rs
+++ b/programs/bpf_loader/src/syscalls.rs
@@ -847,6 +847,12 @@ fn call<'a>(
         let account = account.borrow();
         if message.is_writable(i) && !account.executable {
             *lamport_ref = account.lamports;
+            if data.len() != account.data.len() {
+                return Err(SyscallError::InstructionError(
+                    InstructionError::AccountDataSizeChanged,
+                )
+                .into());
+            }
             data.clone_from_slice(&account.data);
         }
     }