While I was working on a custom encryption module based on the corex network_io_intercept feature, I found a possible memory leak.

Several modules like corex, gzcompress and topoh SREV_NET_DATA_OUT to catch an outgoing message just before sending it out. Those modules receive a buffer with a sip message and in the end of all their trunsformations use build_req_buf_from_sip_req to build a new buffer. build_req_buf_from_sip_req allocated pkg memory for its result and kamailio core clears that buffer after sending it out (forward.h:msg_send_buffer:286). As far as I understood, when we have more than one callback in chain, they override pkg allocated buffer and kamailio core frees only the last one (allocated by the last callback) creating a leek.

Will be happy to be wrong, but can't find how those memory chunks are freed.

Best regargs,

Vitaliy Aleksandrov