While trying to trace down a slow memory leak, and ran across a NULL
pointer exception.
Here is the back trace:
#0 auc_authorize (auc_list=0x10273a2c, msg=0x0, sip=0x10304d34) at
auth_client.c:727
#1 0x10059bb4 in nua_creq_msg (nua=0x10113848, nh=0x10273960,
cr=0x10273994, restart=0, method=sip_method_bye,
name=0x100f21d0 "BYE", tag=0x7fffe9fc, value=271541916) at
nua_stack.c:1780
#2 0x10061c2c in nua_stack_bye (nua=0x10113848, nh=0x10273960,
e=nua_r_bye, tags=0x102f669c) at nua_session.c:2039
#3 0x10056324 in nua_stack_signal (nua=0x10113848, msg=0x7fffeac8,
e=0x102f6688) at nua_stack.c:609
#4 0x100993f4 in su_port_getmsgs (self=0x0) at su_port.c:601
#5 0x1009a388 in su_port_step (self=0x10110b30, tout=10) at su_port.c:1238
#6 0x10091d90 in su_root_step (self=0x10273a2c, tout=0) at su_port.h:295
The actual NULL pointer in auc_authorize was sip->sip_request = 0.
I'm not sure how this came about, but I assume a memory alloc failed
since I've been having a memory leak.
Looking into nua_creq_msg() I see at line: 1701, msg_destroy(msg), msg =
NULL;
Which appears to decide something went wrong, but it allows the function
to continue with msg = NULL, and I think sip maybe pointing to free'd
memory.
I'm not sure how to fix this. I guess the simplest would be to check for
valid msg and sip->sip_request in auc_authorize(), but I think there
might be some better checking in nua_creq_msg().
Now for my real question,...
Is there some documentation on how the su memory allocation routines
keep track of memory ?
I get the idea of the home object. I'm not sure I understand how the
sub_alloc works.
With a typical nua implementation, are there more than the nua and su
home objects ?
Would I expect to see all other allocations as sub objects to these two ?
Any idea's on how to track this down would be helpful. Tracking a memory
leak is quite tricky.
Thanks,
Colin..
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