[mythtv] lirc_client.c sending empty CODE cmd to LIRC -> segfault

Michael T. Dean mtdean at thirdcontact.com
Tue Feb 9 21:09:45 UTC 2010

On 02/09/2010 03:42 PM, David Kubicek wrote:
> Hello,
> I was just playing with the optional lircrcd LIRC daemon and it kept 
> segfaulting on me. I found the bug in the daemon (latest CVS version), 
> but the reason for this is MythTV sending an empty CODE command. Until 
> the bug is fixed in either of these two applications, it'll break 
> advanced LIRC configurations...
> I haven't looked into MythTV, so I have no patch for you, but I'll be 
> sending a patch to LIRC people. If you actually want the patch and it 
> would be integrated soon (e.i. not in 6 months:)) Well, the command 
> packet is actually from lircd, but it really originates in MythTV.
> LOG:
> lircrcd[3673]: received command: "CODE 01007f0000000000 1e Down 
> imon_ultrabay_pad"
> ...
> lircrcd[3673]: received command: "CODE 01007f0000000000 22 Down 
> imon_ultrabay_pad"
> ...
> lircrcd[3673]: received command: "CODE "
> Segfault in lircrcd (not relevant for you):
> #0  0xb764af93 in strlen () from /lib/tls/i686/cmov/libc.so.6
> #1  0xb764acd5 in strdup () from /lib/tls/i686/cmov/libc.so.6
> #2  0x0804a121 in code_func (fd=-1217294348, message=0x0, 
> arguments=0x0) at lircrcd.c:489
> #3  0x0804adbd in get_command (argc=2, argv=0xbfe70a04) at lircrcd.c:646
> #4  loop (argc=2, argv=0xbfe70a04) at lircrcd.c:737
> #5  main (argc=2, argv=0xbfe70a04) at lircrcd.c:1010

Are you sure it's not: http://svn.mythtv.org/trac/ticket/7653 ?  Can you 
test that patch and provide feedback on it?

Also, can you get a fix into lircrcd to accept line feeds properly (you 
mentioned you're already planning to send a patch to the LIRC devs for 
something else)?


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