Bugs item #3594381, was opened at 2012-12-09 19:16
Message generated for change (Comment added) made by bagder
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Category: libcurl
Group: crash
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Con Kolivas (ckolivas)
Assigned to: Daniel Stenberg (bagder)
Summary: Mingw32 crash on calling failf in Curl_recv_plain

Initial Comment:
In the cgminer project ( https://github.com/ckolivas/cgminer ) I am using libcurl version 7.28.1 compiled for mingw32 and using curl easy recv on the raw socket returned. Dropping internet connection on windows* with this compiled version I get a reproducible crash on the following line:
sendf.c:353
      failf(conn->data, "Recv failure: %s", Curl_strerror(conn, err));
Debugging is disabled in the build, but this line reliably crashes on mingw32. Commenting out the line entirely the crash goes away. This can be reproduced without dropping internet connection on windows by killing the tcp connection with currports. I don't know the exact mechanism of the crash without digging further but I suspect conn->data is dereferenced.

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>Comment By: Daniel Stenberg (bagder)
Date: 2012-12-10 00:58

Message:
Can you help us and produce a smallish stand-alone program that can repeat
the problem? In the case of the failure, can you use a debugger/printf and
see what 'conn' and 'data' point to at the time of the problem?

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You can respond by visiting:
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Received on 2012-12-10