Re: [avrdude-dev] avrdude r1160 Segmentation fault

[René Liebscher]

Hi,

ok, maybe not overwritten memory, but at least it writes (and reads) 
data using an uninitialized file descriptor. This brings then the 
strange output that I see on my terminal.

It obviously writes to fd 0 which is stdin, and that I see in terminal, 
0>/dev/null lets disappear it. I never tried before to write something 
in stdin, I did not even know that could work.


René


On 04.05.2013 21:49, René Liebscher wrote:
> Hi,
>
> could you try to revert main.c to version 1159. I moved the display of 
> the programmer before the open command, to see their pin outputs 
> before they try to open, so I could see what they had read from the 
> config file and internally processed with the new pin definitions. (I 
> did this testing without having actually the hardware connected, so 
> open always ended the program. And originally I did not intend to 
> check in the file.)
>
> It seems jtagmkii_display needs you to call jtagmkii_open beforehand. 
> At least I get there some problems (with Ubuntu 12.10), and it looks 
> as would be overwritten somewhere some memory. This might be the 
> reason for the problem. reverting the file should make disappear the 
> segfault. On the other hand, if this really overwrites some memory 
> then there must be some other problem in the code of jtagmkii too, as 
> normally some checking of return values or error codes should reveal 
> the fact that the progammer was not opened beforehand.
>
> René
>
>
> On 04.05.2013 18:36, Joerg Wunsch wrote:
> > As Enoch wrote:
> >
> > > No surprise, I am here with Debian and its our of sync libs
> > > while you are riding on FreeBSD :-)
> > OK, tried it on an Ubuntu, and can confirm the segfault:
> >
> > Writing | ################################################## | 100% 
> > 0.04s
> >
> > avrdude: 336 bytes of flash written
> >
> > Program received signal SIGSEGV, Segmentation fault.
> > 0x0000000000433f93 in jtagmkII_open (pgm=0x6db9c0, port=0x1 <Address 
> > 0x1 out of bounds>) at jtagmkII.c:1555
> > 1555      if (strncmp(port, "usb", 3) == 0) {
> > (gdb) bt
> > #0  0x0000000000433f93 in jtagmkII_open (pgm=0x6db9c0, port=0x1 
> > <Address 0x1 out of bounds>) at jtagmkII.c:1555
> > #1  0x000000000041b756 in do_op (pgm=0x6db9c0, p=0x834100, 
> > upd=0x663430, flags=UF_NONE) at update.c:322
> > #2  0x0000000000404408 in main (argc=<optimized out>, argv=<optimized 
> > out>) at main.c:1241
> >
> > So "port" is given as 0x01 here.  Stack frame #1 is:
> >
> > pgm->vfy_led(pgm, ON);
> >
> > No idea offhand why that triggers a jtagmkII_open() with bogus
> > arguments.
>
>
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