When fetching Prometheus metrics, if tls.so is loaded, the TLS module registers
the clear_text_write_queued_bytes statistic in even when TLS support is
disabled (enable_tls=no or not set).
In that case tls_ct_wq_init() is never called and tls_total_ct_wq stays NULL.
When we call prom_dispatch from xhttp_prom with xhttp_prom_stats=all to query
the data, the callback tls_stats_ct_wq_total_bytes() calls
tls_ct_wq_total_bytes() which dereferences the NULL pointer and causes a
segmentation fault.
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#### Description
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You can view, comment on, or merge this pull request online at:
https://github.com/kamailio/kamailio/pull/4802
-- Commit Summary --
* tls: added null pointer protection to tls_ct_wq_total_bytes() function
-- File Changes --
M src/modules/tls/tls_ct_wrq.c (2)
-- Patch Links --
https://github.com/kamailio/kamailio/pull/4802.patch
https://github.com/kamailio/kamailio/pull/4802.diff
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