From 5ee26a5dd1af3e172610b94b2657af709b319dad Mon Sep 17 00:00:00 2001
From: Dario Nieuwenhuis <dirbaio@dirbaio.net>
Date: Mon, 5 Jun 2023 22:28:14 +0200
Subject: [PATCH] rp/dma: fix use-after-free read.

---
 embassy-rp/src/dma.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/embassy-rp/src/dma.rs b/embassy-rp/src/dma.rs
index 74f4e699..1cbb4651 100644
--- a/embassy-rp/src/dma.rs
+++ b/embassy-rp/src/dma.rs
@@ -75,16 +75,17 @@ pub unsafe fn write<'a, C: Channel, W: Word>(
     )
 }
 
+static DUMMY: u32 = 0;
+
 pub unsafe fn write_repeated<'a, C: Channel, W: Word>(
     ch: impl Peripheral<P = C> + 'a,
     to: *mut W,
     len: usize,
     dreq: u8,
 ) -> Transfer<'a, C> {
-    let dummy: u32 = 0;
     copy_inner(
         ch,
-        &dummy as *const u32,
+        &DUMMY as *const u32,
         to as *mut u32,
         len,
         W::size(),