From bed952022b1147a356e3580592bb1e0a07051299 Mon Sep 17 00:00:00 2001
From: Marko <marbar3778@yahoo.com>
Date: Mon, 20 Nov 2023 11:28:15 +0100
Subject: [PATCH] fix(math): preventative ciel call (#18519)

---
 math/CHANGELOG.md | 4 ++++
 math/dec.go       | 4 ++++
 math/dec_test.go  | 8 ++++++++
 3 files changed, 16 insertions(+)

diff --git a/math/CHANGELOG.md b/math/CHANGELOG.md
index 585006ea2a..e385c915a0 100644
--- a/math/CHANGELOG.md
+++ b/math/CHANGELOG.md
@@ -40,6 +40,10 @@ Ref: https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.j
 
 * [#18421](https://github.com/cosmos/cosmos-sdk/pull/18421) Add mutative api for `LegacyDec.BigInt()`.
 
+### Bug Fixes
+
+* [#18519](https://github.com/cosmos/cosmos-sdk/pull/18519) Prevent Overflow in `Dec.Ceil()`.
+
 ## [math/v1.2.0](https://github.com/cosmos/cosmos-sdk/releases/tag/math/v1.2.0) - 2023-11-07
 
 ### Features
diff --git a/math/dec.go b/math/dec.go
index 1cff954936..4de74b0b37 100644
--- a/math/dec.go
+++ b/math/dec.go
@@ -742,6 +742,10 @@ func (d LegacyDec) Ceil() LegacyDec {
 		return LegacyNewDecFromBigInt(quo)
 	}
 
+	if d.i.BitLen() >= maxDecBitLen {
+		panic("Int overflow")
+	}
+
 	return LegacyNewDecFromBigInt(quo.Add(quo, oneInt))
 }
 
diff --git a/math/dec_test.go b/math/dec_test.go
index 45cec78ae1..96d7231a94 100644
--- a/math/dec_test.go
+++ b/math/dec_test.go
@@ -408,6 +408,14 @@ func (s *decimalTestSuite) TestDecCeil() {
 	}
 }
 
+func (s *decimalTestSuite) TestCeilOverflow() {
+	d, err := math.LegacyNewDecFromStr("66749594872528440074844428317798503581334516323645399060845050244444366430645.000000000000000001")
+	s.Require().NoError(err)
+	s.Require().True(d.BigInt().BitLen() <= 315, "d is too large")
+	// this call panics because the value is too large
+	s.Require().Panics(func() { d.Ceil() }, "Ceil should panic on overflow")
+}
+
 func (s *decimalTestSuite) TestPower() {
 	testCases := []struct {
 		input    math.LegacyDec