From fb8a43fd13e4a9bed6a0a08d1e534e4497a57698 Mon Sep 17 00:00:00 2001
From: Ivan Smirnov <i.s.smirnov@gmail.com>
Date: Mon, 3 Jan 2022 13:04:22 +0300
Subject: [PATCH] Fix potential decoder panic when checking padding

---
 src/decode.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/decode.rs b/src/decode.rs
index 59ca777..8a53f4e 100644
--- a/src/decode.rs
+++ b/src/decode.rs
@@ -1,7 +1,7 @@
 use std::io::Read;
 
 // TODO: can be removed once https://github.com/rust-lang/rust/issues/74985 is stable
-use bytemuck::{cast_slice, cast_slice_mut, Pod};
+use bytemuck::{cast_slice_mut, Pod};
 
 use crate::consts::{
     QOI_HEADER_SIZE, QOI_OP_DIFF, QOI_OP_INDEX, QOI_OP_LUMA, QOI_OP_RGB, QOI_OP_RGBA, QOI_OP_RUN,
@@ -81,7 +81,7 @@ where
 
     if unlikely(data.len() < QOI_PADDING_SIZE) {
         return Err(Error::UnexpectedBufferEnd);
-    } else if unlikely(cast_slice::<_, [u8; QOI_PADDING_SIZE]>(data)[0] != QOI_PADDING) {
+    } else if unlikely(&data[..QOI_PADDING_SIZE] != &QOI_PADDING) {
         return Err(Error::InvalidPadding);
     }