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debugnet: fix an errant assertion

Authored by mhorne on Thu, May 12, 3:47 PM.



We may call debugnet_free() before g_debugnet_pcb_inuse is true,
specifically in the cases where the interface is down or does not
support debugnet. pcb->dp_drv_input is used to hold the real driver
if_input callback while debugnet is in use, so we can check the status
of this field in the assertion.

This can be triggered trivially by trying to configure netdump on an
unsupported interface at the ddb prompt.

Initializing the dp_drv_input field to NULL explicitly is not necessary
but helps display the intent.

PR: 263929
Reported by: Martin Filla <>

Diff Detail

R10 FreeBSD src repository
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.