[erlang-bugs] ASN.1 encoder does not check constraint

Maxim Treskin <>
Fri Jul 10 09:33:18 CEST 2009


Hello
I found situation when ASN.1 runtime encoder does not check constraint:

The Number defined in StructA.asn as:

Number    ::= OCTET STRING (SIZE(minNumberLength..maxNumberLength))
minNumberLength     INTEGER ::= 1
maxNumberLength INTEGER ::= 5


Then in StructB.asn Number is imported, and used as:

Data ::= SEQUENCE
{
  version      [0] INTEGER,
  number       [1] Number
}

So, after compilation of this two asn-files we have encoder module for
StructB, but this encoder does not check Number size constraint:

1> 'StructB':encode('Data', {'Data', 1, "34"}).
{ok,[48,7,128,1,1,129,2,51,52]}
2> 'StructB':encode('Data', {'Data', 1, ""}).
{ok,[48,5,128,1,1,129,0]}
3> 'StructB':encode('Data', {'Data', 1, "3444455555554"}).
{ok,[48,18,128,1,1,129,13,51,52,52,52,52,53,53,53,53,53,53, 53,52]}


Thank you

-- 
Maxim Treskin
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