[bump_v18.09] Fix nil pointer dereference in node allocation#2767
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[bump_v18.09] Fix nil pointer dereference in node allocation#2767dperny wants to merge 1 commit into
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When the network allocator starts, it performs two passes of allocation. The first, with existingAddressesOnly set to "true", simply re-allocates any already reserved addresses, which make the local driver state consistent with the state in swarmkit's object store. The second pass then performs any outstanding new allocations, from when the allocator last stopped. Since moby#2725, nodes only have attachments allocated for them if they have a task currently scheduled which requires those networks. This happens after a task is allocated and scheduled. Before this change, it was possible that, if a Task was correctly allocated, but the allocator stopped before the Node was also allocated, during the restore phase, an empty api.NetworkAttachment object was added to the Node's attachments. Then, in the new allocations phase, when trying to process all attachments, we were unconditionally looking at the NetworkAttachment object's Network field, which was nil. This caused a segfault and crash. With this change, we no longer add these errant NetworkAttachment objects to nodes. Signed-off-by: Drew Erny <drew.erny@docker.com> (cherry picked from commit 2d71271) Signed-off-by: Drew Erny <drew.erny@docker.com>
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Backports #2764 to the newly-named bump_v18.09 branch.