fix: nil pointer panic on NewIntFromBigInt (backport cosmos#9627) (c…

…osmos#10845)

* types: fix nil pointer panic on `NewIntFromBigInt` (cosmos#9627)

(cherry picked from commit 7f90374)

# Conflicts:
#	CHANGELOG.md

* fix conflicts

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>
Co-authored-by: Aleksandr Bezobchuk <aleks.bezobchuk@gmail.com>

CHANGELOG.md

@@ -51,6 +51,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
+* (types) [\#9627](https://github.com/cosmos/cosmos-sdk/pull/9627) Fix nil pointer panic on `NewBigIntFromInt`.
 * [#10725](https://github.com/cosmos/cosmos-sdk/pull/10725) populate `ctx.ConsensusParams` for begin/end blockers.
 
 ## [v0.44.5](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.44.5) - 2021-12-02

math/int.go

@@ -129,13 +129,12 @@ func NewIntFromUint64(n uint64) Int {
 
 // NewIntFromBigInt constructs Int from big.Int. If the provided big.Int is nil,
 // it returns an empty instance. This function panics if the bit length is > 256.
-// Note, the caller can safely mutate the argument after this function returns.
 func NewIntFromBigInt(i *big.Int) Int {
 	if i == nil {
 		return Int{}
 	}
 
-	if bigIntOverflows(i) {
+	if i.BitLen() > maxBitLen {
 		panic("NewIntFromBigInt() out of bound")
 	}