If the button shield command cannot be executed due to an underlying
error then resp is NULL. Avoid the crash by adding the appropriate
check.
Closes: #694
If FP_DEVICE_EMULATION is set, then switch to using predictable EC
ephemeral key and random numbers. This should allow recording and
replaying real device interactions using umockdev.
This adds a base class for SDCP devices. Not all functionality has been
fully tested, in particular the code to verify the model certificate is
most likely broken or incomplete. One problem there is that there is no
code to find the root CA to trust.
See: #257
../libfprint/drivers/uru4000.c:743:35: runtime error: left shift of 138 by 24
places cannot be represented in type 'int'
#0 0x7fa3e696e06d in imaging_run_state ../libfprint/drivers/uru4000.c:743
#1 0x7fa3e6a366f6 in __ssm_call_handler ../libfprint/fpi-ssm.c:254
#2 0x7fa3e6a38cc8 in fpi_ssm_next_state ../libfprint/fpi-ssm.c:465
#3 0x7fa3e696bd07 in sm_read_reg_cb ../libfprint/drivers/uru4000.c:515
#4 0x7fa3e6a3db74 in transfer_finish_cb ../libfprint/fpi-usb-transfer.c:352
#5 0x7fa3ed9b9862 in g_task_return_now ../../glib/gio/gtask.c:1363
#6 0x7fa3ed9b989c in complete_in_idle_cb ../../glib/gio/gtask.c:1377
#7 0x7fa3ede4a70b in g_main_dispatch ../../glib/glib/gmain.c:3373
#8 0x7fa3ede4c8de in g_main_context_dispatch_unlocked ../../glib/glib/gmain.c:4224
#9 0x7fa3ede4c8de in g_main_context_iterate_unlocked ../../glib/glib/gmain.c:4289
#10 0x7fa3ede4cfef in g_main_context_iteration ../../glib/glib/gmain.c:4354
#11 0x7fa3e68d4a1b in fp_device_capture_sync ../libfprint/fp-device.c:2048
We had some read issues, so let's just use the safer reader that
makes things cleaner too
../libfprint/drivers/goodixmoc/goodix_proto.c:418:42: runtime error:
load of misaligned address 0x0000115ced29 for type 'uint16_t', which
requires 2 byte alignment
0x0000115ced29: note: pointer points here
00 c0 3f 00 21 64 1c 00 00 00 00 64 00 43 01 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
^
#0 0x7f974ff9e868 in gx_proto_parse_body ../libfprint/drivers/goodixmoc/goodix_proto.c:418
#1 0x7f974ff8ec79 in fp_cmd_receive_cb ../libfprint/drivers/goodixmoc/goodix.c:185
#2 0x7f975003ca0c in transfer_finish_cb ../libfprint/fpi-usb-transfer.c:352
#3 0x7f9756e57862 in g_task_return_now ../../glib/gio/gtask.c:1363
#4 0x7f9756e5789c in complete_in_idle_cb ../../glib/gio/gtask.c:1377
#5 0x7f97577f070b in g_main_dispatch ../../glib/glib/gmain.c:3373
#6 0x7f97577f28de in g_main_context_dispatch_unlocked ../../glib/glib/gmain.c:4224
#7 0x7f97577f28de in g_main_context_iterate_unlocked ../../glib/glib/gmain.c:4289
#8 0x7f97577f2fef in g_main_context_iteration ../../glib/glib/gmain.c:4354
#9 0x7f974fed4656 in fp_device_verify_sync ../libfprint/fp-device.c:1976
This is was leading to a potential error due to misaligned memory:
../libfprint/drivers/goodixmoc/goodix.c:167:20: runtime error: load of
misaligned address 0x00001165c989 for type 'uint32_t', which requires 4 byte
alignment
0x00001165c989: note: pointer points here
00 00 00 00 0a ac b3 09 00 00 00 00 00 00 55 53 42 00 00 00 00 00 56 42 53 00 00 00 00 00 30 30
^
#0 0x7ff3ba98d190 in fp_cmd_receive_cb ../libfprint/drivers/goodixmoc/goodix.c:167
#1 0x7ff3baa3b235 in transfer_finish_cb ../libfprint/fpi-usb-transfer.c:352
#2 0x7ff3c18ca862 in g_task_return_now ../../glib/gio/gtask.c:1363
#3 0x7ff3c18ca89c in complete_in_idle_cb ../../glib/gio/gtask.c:1377
#4 0x7ff3c228470b in g_main_dispatch ../../glib/glib/gmain.c:3373
#5 0x7ff3c22868de in g_main_context_dispatch_unlocked ../../glib/glib/gmain.c:4224
#6 0x7ff3c22868de in g_main_context_iterate_unlocked ../../glib/glib/gmain.c:4289
#7 0x7ff3c2286fef in g_main_context_iteration ../../glib/glib/gmain.c:4354
#8 0x7ff3ba8d2fe5 in fp_device_open_sync ../libfprint/fp-device.c:1874
