tree fd791c088f9f74d150d55409e787068ccf48af5e
parent 32aff359ae4472f745691d603410ec42c37e5bf6
author Philipp Maier <pmaier@sysmocom.de> 1653407417 +0200
committer Philipp Maier <pmaier@sysmocom.de> 1653407980 +0200

reader: more meaningful null pointer check in get_sw

At the moment msgb_apdu_de(resp) is used to check if the msgb that is
handed over to get_sw is properly populated with data.

However, since msgb_apdu_de() is just adding an offset, which cannot be
0 to ->l2h the returned value also can never be NULL. This means that we
cannot use msgb_apdu_de() to detect if resp contains a nullpointer.

Lets check if ->l2h is not NULL instead. This will make sure that ->l2h
is populated.

Change-Id: I32bc56c9264c01911a4f4b4f911b09e955205010
Related: OS#5560