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A new Flyspray task has been opened. Details are below.
User who did this - Vicente Hernando (vicente)
Attached to Project - sip-router
Summary - ndb_redis redisc_free_reply bug
Task Type - Bug Report
Category - Module
Status - Unconfirmed
Assigned To -
Operating System - All
Severity - Critical
Priority - Normal
Reported Version - Development
Due in Version - Undecided
Due Date - Undecided
Details - Due to ndb_redis redisc_free_reply function I created in
redis_client.c file, a bug has appeared able to crash kamailio.
In pv_get_redisc function in ndb_redis_mod.c these lines appear:
if(rpv->reply==NULL)
{
rpv->reply = redisc_get_reply(&rpv->rname);
if(rpv->reply==NULL)
return pv_get_null(msg, param, res);
}
That means it stores old redisc_reply_t in rpv->reply and if it has been freed
with redisc_free_reply function a segmentation fault would happen.
I find three solutions:
patch one changes if(rpv->reply==NULL) into if(1). Disadvantage is it will
always have to search the reply using redisc_get_reply adding some overhead.
patch two changes redisc_free_reply function and deletes only inner redisReply
structure. So once a redisc_reply_t is created it could be reused, but never
deleted.
Another solution would be completely deleting redisc_free_reply function.
In my opinion second and third approaches are the best.
Any comments?
More information can be found at the following URL:
http://sip-router.org/tracker/index.php?do=details&task_id=242
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