Re: [RFA] gdbserver with reversed arguments seg. fault

[Denis PILAT <denis dot pilat at st dot com>]

Daniel Jacobowitz wrote:
> On Wed, Jan 03, 2007 at 10:29:49AM +0100, Denis PILAT wrote:
>   
> > Hi,
> >
> > Following our discussion in the thread 
> > http://sources.redhat.com/ml/gdb-patches/2007-01/msg00059.html
> > I'm proposing the attached patch to fix a segmentation fault that occurs 
> > into gdbserver when you revert the binary filename with the "host:port" 
> > argument.
> > In inferiors.c the inferior_target_data() function is called with a NULL 
> > pointer argument. At the beginning I though of testing arguments but 
> > none of them are tested in this whole file so I concluded it's up to the 
> > caller to do so.
> >     
>
> What exactly did you do to get this crash?  What's the backtrace look
> like?  It didn't happen for me.
>
>   
Here is the output :
 > ./gdbserver ~/tmp/hello/hello.out :2222
 Cannot exec :2222: No such file or directory.
 Process :2222 created; pid = 25945

 Child exited with retcode = 7f
 Could not open remote device: Invalid argument.
 Killing inferior
 Segmentation fault (core dumped)

Here is the backtrace:
 Program received signal SIGSEGV, Segmentation fault.
 inferior_target_data (inferior=0x0)
     at 
/project/flexdbug/user/pd10/gdb/sts-gdb-repository/vendor/gdb/gdb/gdbserver/inferiors.c:227
 227     {
 (gdb) bt
 #0  inferior_target_data (inferior=0x0)
     at 
/project/flexdbug/user/pd10/gdb/sts-gdb-repository/vendor/gdb/gdb/gdbserver/inferiors.c:227
 #1  0x0804e2a9 in main (argc=3, argv=0xbfff9414)
     at 
/project/flexdbug/user/pd10/gdb/sts-gdb-repository/vendor/gdb/gdb/gdbserver/server.c:620