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Object reference not set to an instance of object

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alehandro



Joined: 16 Nov 2010
Posts: 35

PostPosted: Tue Nov 16, 2010 12:22 am    Post subject: Object reference not set to an instance of object Reply with quote

Hi, interesting bug found

while decompiling one deobfuscated dll I've found that Reflector cant handle a tricky case.

Description:

Please refer to the assembly.
For some methods of c0000a0, for example, "aqc10xGJ6", it has a custom attribute:

.custom /*0C00052B:060009FA*/ instance void NS021.c0000a0/*020000A0*//attr161Attribute/*020000A1*/::.ctor(object) /* 060009FA */
= {object(type(class 'c0000a2[[System.Object, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]][]'))}
// = ( 01 00 50 67 63 30 30 30 30 61 32 5B 5B 53 79 73 // ..Pgc0000a2[[Sys
// 74 65 6D 2E 4F 62 6A 65 63 74 2C 20 6D 73 63 6F // tem.Object, msco
// 72 6C 69 62 2C 20 56 65 72 73 69 6F 6E 3D 32 2E // rlib, Version=2.
// 30 2E 30 2E 30 2C 20 43 75 6C 74 75 72 65 3D 6E // 0.0.0, Culture=n
// 65 75 74 72 61 6C 2C 20 50 75 62 6C 69 63 4B 65 // eutral, PublicKe
// 79 54 6F 6B 65 6E 3D 62 37 37 61 35 63 35 36 31 // yToken=b77a5c561
// 39 33 34 65 30 38 39 5D 5D 5B 5D 00 00 ) // 934e089]][]..

When .Net Reflector read this custom attribute, it try to parse "b77a5c561934e089]]" as PublicKeyToken, so internal exception occurs and prevent it from decompiling the method.

If you remove the custom attribute, the method should be ok in Reflector.

here is the deobfuscated assembly
http://www.multiupload.com/JG51HXCKME

Please let me know if Reflector could understand that custom attribute is not a real PublicKeyToken so it stop crashing on lots of assemblies!
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Clive Tong



Joined: 04 Dec 2008
Posts: 283

PostPosted: Tue Nov 16, 2010 9:25 am    Post subject: Reply with quote

Thanks for reporting this.

As you say, the token parsing code is trying to parse the hex values of the token with the ]] appended.

I've logged it in our bug tracking database as issue 774.
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alehandro



Joined: 16 Nov 2010
Posts: 35

PostPosted: Tue Nov 16, 2010 12:50 pm    Post subject: Re: Reply with quote

Clive Tong wrote:
Thanks for reporting this.

As you say, the token parsing code is trying to parse the hex values of the token with the ]] appended.

I've logged it in our bug tracking database as issue 774.


Hi, Clive
Thanks for your reply
Are there any schedules for releasing new version?
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Clive Tong



Joined: 04 Dec 2008
Posts: 283

PostPosted: Tue Nov 16, 2010 2:47 pm    Post subject: Reply with quote

It should be fixed for the next EAP release. That will probably be in the next couple of months.
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alehandro



Joined: 16 Nov 2010
Posts: 35

PostPosted: Tue Nov 16, 2010 3:05 pm    Post subject: Re: Reply with quote

Clive Tong wrote:
It should be fixed for the next EAP release. That will probably be in the next couple of months.


Last question: it'll be fixed for both products (Refl & Refl Pro) ?
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Clive Tong



Joined: 04 Dec 2008
Posts: 283

PostPosted: Tue Nov 16, 2010 3:10 pm    Post subject: Reply with quote

Yes.
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nmpham



Joined: 28 Jun 2005
Posts: 12

PostPosted: Wed Nov 17, 2010 9:57 am    Post subject: Re: Reply with quote

Clive Tong wrote:
It should be fixed for the next EAP release. That will probably be in the next couple of months.


Can we have a hotfix for this, because Reflector crashes on a lot of assembly now
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