Suricata

  CC       detect.o
detect.c:1238:38: warning: Access to field 'de_state' results in a dereference of a null pointer (loaded from variable 'txd') [core.NullDereference]
    DetectEngineState *tx_de_state = txd->de_state;
                                     ^~~~~~~~~~~~~
1 warning generated.

txd is almost everywhere a part of the transaction structure, where it can't be NULL if we have a tx. However in the case of HTTP we can have a tx w/o a HTPTxUserData object which means it is possible to have a NULL txd in some edge cases.

Now a HTP tx w/o a HTPTxUserData is useless from the Suricata perspective, so I wonder if we can somehow "hide" a tx like that from Suricata.

Introduced in https://github.com/OISF/suricata/commit/1ad71b96daa2b2655691cfce2a15ccd754d9b290#diff-ee484ae4b77e59eb8b6b50f628c84ab626bd6178a6d43e1219dbc9619be7e027R1238