lang: Check that ProgramAccount writable on deref_mut (#681)

coral-xyz · Sep 7, 2021 · 675c7cd · 675c7cd
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -11,6 +11,10 @@ incremented for features.
 
 ## [Unreleased]
 
+### Features
+
+* lang: Check that ProgramAccount writable before mut borrow (`anchor-debug` only) ([#681](https://github.com/project-serum/anchor/pull/681)).
+
 ## [0.14.0] - 2021-09-02
 
 ### Features

diff --git a/lang/src/program_account.rs b/lang/src/program_account.rs
@@ -156,6 +156,12 @@ impl<'a, T: AccountSerialize + AccountDeserialize + Clone> Deref for ProgramAcco
 
 impl<'a, T: AccountSerialize + AccountDeserialize + Clone> DerefMut for ProgramAccount<'a, T> {
  fn deref_mut(&mut self) -> &mut Self::Target {
+ #[cfg(feature = "anchor-debug")]
+ if !self.inner.info.is_writable {
+ solana_program::msg!("The given ProgramAccount is not mutable");
+ panic!();
+ }
+
  &mut DerefMut::deref_mut(&mut self.inner).account
  }
 }