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H A D | xen-netfront.c | d86b5672 Thu May 11 06:58:06 CDT 2017 Vitaly Kuznetsov <vkuznets@redhat.com> xen-netfront: avoid crashing on resume after a failure in talk_to_netback()
Unavoidable crashes in netfront_resume() and netback_changed() after a previous fail in talk_to_netback() (e.g. when we fail to read MAC from xenstore) were discovered. The failure path in talk_to_netback() does unregister/free for netdev but we don't reset drvdata and we try accessing it after resume.
Fix the bug by removing the whole xen device completely with device_unregister(), this guarantees we won't have any calls into netfront after a failure.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> d86b5672 Thu May 11 06:58:06 CDT 2017 Vitaly Kuznetsov <vkuznets@redhat.com> xen-netfront: avoid crashing on resume after a failure in talk_to_netback() Unavoidable crashes in netfront_resume() and netback_changed() after a previous fail in talk_to_netback() (e.g. when we fail to read MAC from xenstore) were discovered. The failure path in talk_to_netback() does unregister/free for netdev but we don't reset drvdata and we try accessing it after resume. Fix the bug by removing the whole xen device completely with device_unregister(), this guarantees we won't have any calls into netfront after a failure. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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