From a8c1d430ef877d4002b70f352c612f0902e682d6 Mon Sep 17 00:00:00 2001
From: Koute <koute@users.noreply.github.com>
Date: Tue, 7 Jun 2022 01:17:41 +0900
Subject: [PATCH] Fix one-by-off in `BoundedSlice::try_from` (#11600)

---
 .../frame/support/src/storage/bounded_vec.rs     | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/substrate/frame/support/src/storage/bounded_vec.rs b/substrate/frame/support/src/storage/bounded_vec.rs
index f1f4330ab2..232f9f97fc 100644
--- a/substrate/frame/support/src/storage/bounded_vec.rs
+++ b/substrate/frame/support/src/storage/bounded_vec.rs
@@ -135,7 +135,7 @@ impl<T: Ord, Bound: Get<u32>> Ord for BoundedVec<T, Bound> {
 impl<'a, T, S: Get<u32>> TryFrom<&'a [T]> for BoundedSlice<'a, T, S> {
 	type Error = ();
 	fn try_from(t: &'a [T]) -> Result<Self, Self::Error> {
-		if t.len() < S::get() as usize {
+		if t.len() <= S::get() as usize {
 			Ok(BoundedSlice(t, PhantomData))
 		} else {
 			Err(())
@@ -1007,4 +1007,18 @@ pub mod test {
 			_ => unreachable!("deserializer must raise error"),
 		}
 	}
+
+	#[test]
+	fn bounded_vec_try_from_works() {
+		assert!(BoundedVec::<u32, ConstU32<2>>::try_from(vec![0]).is_ok());
+		assert!(BoundedVec::<u32, ConstU32<2>>::try_from(vec![0, 1]).is_ok());
+		assert!(BoundedVec::<u32, ConstU32<2>>::try_from(vec![0, 1, 2]).is_err());
+	}
+
+	#[test]
+	fn bounded_slice_try_from_works() {
+		assert!(BoundedSlice::<u32, ConstU32<2>>::try_from(&[0][..]).is_ok());
+		assert!(BoundedSlice::<u32, ConstU32<2>>::try_from(&[0, 1][..]).is_ok());
+		assert!(BoundedSlice::<u32, ConstU32<2>>::try_from(&[0, 1, 2][..]).is_err());
+	}
 }