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Re: failed tests building curl 7.26

From: Daniel Stenberg <>
Date: Thu, 7 Jun 2012 15:27:05 +0200 (CEST)

On Wed, 6 Jun 2012, Neil Bowers wrote:

> Aha, result!

Test 554 and 587 run the same code so there's no wonder they both show the
same crash.

> #2 0x0000000100008c3b in AddFormData (formp=0x7fff5fbff2d0,
> type=FORM_CONTENT, line=0x10015cdc8, length=4294967305, size=0x7fff5fbff2b0)
> at formdata.c:805

Here is the error visible. length is exactly 32bits too big. The actual size
as passed in from lib554.c is 9, and this vale (4294967305) is 0x100000009.

The question is why. The code has some annoying typecasts between types long
and size_t, but I didn't detect any particular flaw and it works on lots of
other systems both 32bit and 64bit so it really isn't easy to spot the flaw.

I also checked and the formdata source code really hasn't changed much in a
long while...

Can you figure out how that value gets so wrong? I can't repeat this error on
any of my machines... (I don't have any mac)

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Received on 2012-06-07