If I do a substring operation where I extract the middle of a string, I
occasionally get results that are not correct. Example code:
$var(x) = $(var(y){s.substr,1,5});
This seems to be the same issue as:
http://sip-router.1086192.n5.nabble.com/PATCH-Memory-corruption-using-s-substr-transformation-td118002.html
This issue had a fix which added "tr_string_clone_result" in numerous exit
points in pv_trans.c:
https://github.com/kamailio/kamailio/commit/fe7e4a5152674aa9c81c09dd2fc9938d9e9e762e
It seemed to be missing at the exit path for the substring operation which may
explain my observation. See:
https://github.com/kamailio/kamailio/blob/master/src/modules/pv/pv_trans.c#L617
I also notice that this is not used in some other string operations which leads
me to wonder if this problem is more prevalent (likely, since I've heard
reports of similar symptoms with the replace).
Suggestion:
Investigate if we can have this "tr_string_clone_result" called here and remove
all other occurrences in the switch clause.
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