Click here for full details on this thread,
http://groups.google.co.in/group/mailing.unix.net-snmp-coders/browse_thr
ead/thread/7941c72cd8bed519/e4617b5803c167a8?lnk=st&q=NETSNMP_ITERATOR_F
LAG_SORTED&rnum=10&hl=en
MT> if (iinfo->flags & NETSNMP_ITERATOR_FLAG_SORTED) {
MT> callback_loop_context = table_info;
MT> }
MT> index_search =
MT> (iinfo->get_first_data_point) (&callback_loop_context,
MT> &callback_data_context,
MT> index_search, iinfo);
MT>
MT> Comments?
With sorted table registration if "index_search" is NULL then the
following statements will be executed,
/* free loop context before going on */
if (callback_loop_context &&
iinfo->free_loop_context_at_end) {
(iinfo->free_loop_context_at_end)
(callback_loop_context,
iinfo);
callback_loop_context = NULL;
}
The argument "callback_loop_context" is having address of "table_info"
and which is being passed to "iinfo->free_loop_context_at_end" function.
This leads to calling "iinfo->free_loop_context_at_end" function even
when get_first_data_point returns NULL without setting
"my_loop_context".
In "free_loop_context_at_end" function I am freeing the memory allocated
in get_first_data_point. I am typecasting "callback_loop_context" passed
to "free_loop_context_at_end" function to my local structure for freeing
memory. Becasue of "table_info" is assigned to "callback_loop_context"
my free call will crash.
If I am right, we need to set "my_loop_context" to NULL while returning
NULL from get_first_data_point function. However I am not sure about the
faster access of data is not affected with the suggested fix.
Thanks
-JP
NextHop Technologies
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