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Date:	Fri, 23 Nov 2001 19:39:55 -0500
From:	Christopher Faylor <cgf AT redhat DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: 1.3.5 access violation at 61013ED4 (net.cc)
Message-ID:	<20011124003955.GA11599@redhat.com>
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References:	<003101c17455$d9a3d700$0101a8c0 AT intelix DOT com>
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On Fri, Nov 23, 2001 at 01:34:15PM -0600, Joe Hagen wrote:
>Using the fetchmail program under NT4, the
>subject access violation occurred.
>
>Disassembly of the code revealed that it was
>in the "is_nonblocking()" method of an "fhandler_socket"
>object.
>
>In net.cc, there are unchecked results from an assignment
>to an fhandler_socket* from cygheap->fdtab[fd].
>
>I suspect the file descriptor was NULL because of a socket
>connection loss.  However, the member function is invoked
>unconditionally.
>
>The access violation is a result of dereferncing a member
>of the class using a NULL pointer.
>
>The affected functions are: 
>            cygwin_sendto
>            cygwin_recvfrom
>            cygwin_getpeername
>            cygwin_recv
>            cygwin_send
>
>
>I've created a patch file (diff -up) but this is my first time
>submitting a report.

There was not patch attached to this message so I've patched
the above offending functions myself.

Thanks very much for the analysis.

cgf

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