3 files changed, 11 insertions, 2 deletions
diff --git a/lib/asn1/src/asn1ct_imm.erl b/lib/asn1/src/asn1ct_imm.erl
index 20785cda8c..047156fc10 100644
--- a/lib/asn1/src/asn1ct_imm.erl
+++ b/lib/asn1/src/asn1ct_imm.erl
@@ -2155,8 +2155,10 @@ fixup_put_bits(Other) -> per_fixup(Other).
 %% returns a value range that has the lower bound set to the lowest value
 %% of all single values and lower bound values in C and the upper bound to
 %% the greatest value.
-effective_constraint(integer,[C={{_,_},_}|_Rest]) -> % extension
-    [C];
+effective_constraint(integer, [{{_,_}=Root,_}|_Rest]) ->
+    %% Normalize extension. Note that any range given for the
+    %% extension should be ignored anyway.
+    [{Root,[]}];
 effective_constraint(integer, C) ->
     SVs = get_constraints(C, 'SingleValue'),
     SV = effective_constr('SingleValue', SVs),
diff --git a/lib/asn1/test/asn1_SUITE_data/Constraints.py b/lib/asn1/test/asn1_SUITE_data/Constraints.py
index 864a471b88..c3b3aebd6d 100644
--- a/lib/asn1/test/asn1_SUITE_data/Constraints.py
+++ b/lib/asn1/test/asn1_SUITE_data/Constraints.py
@@ -16,6 +16,9 @@ SemiConstrained ::= INTEGER (100..MAX)
 NegSemiConstrained ::= INTEGER (-128..MAX)
 SemiConstrainedExt ::= INTEGER (42..MAX, ...)
 NegSemiConstrainedExt ::= INTEGER (-128..MAX, ...)
+-- Extensions --
+LongLongExt ::= INTEGER (0..18446744073709551615, ..., -5000..-1)
+Range256to65536Ext ::= INTEGER (256..65536, ..., 1000000..9000000)
 
 -- Union of single values
 Sv1 ::= INTEGER (2|3|17)
diff --git a/lib/asn1/test/testConstraints.erl b/lib/asn1/test/testConstraints.erl
index 23322f5e88..54ba748519 100644
--- a/lib/asn1/test/testConstraints.erl
+++ b/lib/asn1/test/testConstraints.erl
@@ -70,6 +70,8 @@ int_constraints(Rules) ->
     %%==========================================================
     LastNumWithoutLengthEncoding = 65536,
     roundtrip('Range256to65536', LastNumWithoutLengthEncoding),
+    roundtrip('Range256to65536Ext', LastNumWithoutLengthEncoding),
+    roundtrip('Range256to65536Ext', 42),
 
     FirstNumWithLengthEncoding = 65537,
     roundtrip('LargeConstraints', 'RangeMax', FirstNumWithLengthEncoding),
@@ -95,6 +97,8 @@ int_constraints(Rules) ->
     %% Random number within longlong range
     LongLong = 12672809400538808320,
     roundtrip('LongLong', LongLong),
+    roundtrip('LongLongExt', LongLong),
+    roundtrip('LongLongExt', -10000),
 
     %%==========================================================
     %%  Constraint Combinations (Duboisson p. 285)