K 10
svn:author
V 6
mhorne
K 8
svn:date
V 27
2020-12-02T17:37:32.078828Z
K 7
svn:log
V 624
em: fix a null de-reference in em_free_pci_resources

A failure in iflib_device_register() can result in
em_free_pci_resources() being called after receive queues have already
been freed. In particular, a failure to allocate IRQ resources will goto
fail_queues, where IFDI_QUEUES_FREE() will be called via
iflib_tx_structures_free(), preceding the call to IFDI_DETACH().

Cope with this by checking adapter->rx_queues before dereferencing it.
A similar check is present in ixgbe(4) and ixl(4).

MFC after:	1 week
Sponsored by:	NetApp, Inc.
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D27260

END