INKVConnInternal::do_io_*: handle null buffer (#11789) #11802
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It's common for users of VC's to cancel io via a 0 byte, nullptr read or write on the VC. INKVConnInternal::do_io_read and INKVConnInternal::do_io_write were not prepared to handle such cancellations. This updates them to handle this gracefully rather than crashing on a nullptr dereference. This change is was found to be needed for the multiplexer plugin for handling HttpTunnel aborts. For reference, see, for example, UnixNetVConnection::do_io_read which handles a nullptr MIOBuffer. This basically copies that logic into INKVConnInternal so it handles cancellation gracefully.
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[approve ci centos] |
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It's common for users of VC's to cancel io via a 0 byte, nullptr read or write on the VC. INKVConnInternal::do_io_read and
INKVConnInternal::do_io_write were not prepared to handle such cancellations. This updates them to handle this gracefully rather than crashing on a nullptr dereference. This change is was found to be needed for the multiplexer plugin for handling HttpTunnel aborts.
For reference, see, for example, UnixNetVConnection::do_io_read which handles a nullptr MIOBuffer. This basically copies that logic into INKVConnInternal so it handles cancellation gracefully.